Custom Harmonicas by Andrew Zajac
The most expressive harmonicas

Main navigation

  • Home
  • Custom Harmonicas
  • My Combs
  • Tool Kits and Accessories
  • Learning Products
  • Blog
  • Service
  • Dealers
  • About
  • Contact

Breadcrumb

  • Home
  • Blog posts

Andrew's blog

Harmonica Screws, pack of 12 (50 cents per screw)

By Andrew | 3:15 PM EST, Sun December 07, 2014

Harmonica screws for Hohner, Seydel, Suzuki and Lee Oskar

Looking for Pozidriv? It doesn't matter what type of head is used: Slotted, Phillips, Pozidriv, etc... They all work. What's important to match is the size and length of the screw. I chose Phillips head screws because Pozidriv screwdrivers are harder to find. It makes life simple!

High-quality screws for any brand of harmonica. These screws are made from A2 Stainless Steel (304)

  • Read more about Harmonica Screws, pack of 12 (50 cents per screw)

Harmonica Screws, pack of 100 (30 cents per screw)

By Andrew | 8:29 AM EST, Fri December 05, 2014

Harmonica screws for Hohner, Seydel, Suzuki and Lee Oskar

Looking for Pozidriv? It doesn't matter what type of head is used: Slotted, Phillips, Pozidriv, etc... They all work. What's important to match is the size and length of the screw. I chose Phillips head screws because Pozidriv screwdrivers are harder to find. It makes life simple!

High-quality screws for any brand of harmonica. These screws are made from A2 Stainless Steel (304)

  • Read more about Harmonica Screws, pack of 100 (30 cents per screw)

Mysterious embossing instructions

By Andrew | 9:24 AM EST, Fri November 14, 2014

Embossing decrease the space between the reed and the edges of the slot. With higher tolerances can come better performance - the harmonica responds better and plays louder.

The thing about embossing is that so much can go wrong. Fixing the damage can take more time than it takes to do the actual work of embossing the slots.

So how to you "walk the line" to get maximum benefit without creating problems for yourself?

Some folks advocate special tools. Some use a light table. Others use a microscope - sometimes.

All those things can work well. But every method has its disadvantages.

For example, a fast-acting tool can overshoot the mark causing you to work against yourself. A light table only shows you two dimensions and as the reed passes through the slot in three dimensions, you can be left confused as to what you are seeing. A microscope can be overkill - you may not even need one if you have good eyesight. You certainly don't need to use magnification to do most of the work - if anything, you would want to shorten your view of the slot instead of zooming into one segment. But if you are over 40 years of age, using some form of magnification is probably good idea.

Let me share a secret with you: You can get top-level results using simple methods that don't rely on fancy technology.

How?

I'm not telling you. I don't make a habit of keeping secrets, but this is something I have never shared before in public.

I am happy to show folks the basics of how to tweak harmonicas and I have a strong preference for some methods, but there are may ways to get a task done. You don't need to know this secret to do a great job. This method's advantage is that it makes things easier and saves lots of time if you do it correctly.

Again, I'm not going to tell you what it is. I will, however, give you a clue.

Here it is. Print it out. (It's a way of looking at embossing.)

Contact me if you think you have it figured out. I'll let you know whether you are hot or cold. I'll add the most interesting responses to this page as they come in.

Good luck and don't hesitate to contact me!

2014/11/24 - Stephen C. described the way he holds the reed plate to "get a pretty good sense of what's going on in the space between the reed and the plate" and he's very close to what I describe!

2014/12/25 - Jaime G. wrote about "aligning tip edge with edge under rivet (to emboss) with a secure and efficient method."

EDIT: The mystery is over! My explanation can be found here!

Front
  • Read more about Mysterious embossing instructions

Tweaking harmonicas: Measure what you change

By Andrew | 5:02 PM EST, Tue November 11, 2014

This is about methodology.

I made yet another harmonica tweaking video.

Here's a video demonstrating some of the things that are straightforward to quantify so that you can make changes that have a measurable benefit.

Some of these things include:

Tuning: It's easy to measure the pitch of a reed and whether it's in tune with another reed. Play all the octaves available and listen for "beating".

Bending: Bend the 3 draw (or any other bend) with as little force as you possibly can. You will find a "blind spot" somewhere in the middle where the workload is handed off from the draw reed to the blow reed as you bend down. How much work is needed to "skip over" this blind spot can be felt, albeit subjectively; it tends to be more work on lower key harps. We learn to "skip over" this blind spot early on when we are learning to bend. A well-playing harp can be played with very little breath force without having to work hard around the "blind spot".

Reed shape efficiency: By playing a single reed using your lips on the plate off the comb, you can get sensory feedback on how easily the note responds, how much flow you need to make the note sound strong, and how loud the note is. A well-shaped reed will make the whole reed plate vibrate when you play it.

Reed shape efficiency (again): By bending the single reed's note down, you can determine if the reed is prone to squealing. That's a great indicator of how efficiently the reed is set up.

Front
  • Read more about Tweaking harmonicas: Measure what you change

Sending harmonica reed plates by mail (the safe way!)

By Andrew | 11:55 AM EDT, Sat August 30, 2014

I usually prefer to work on a harmonica along with its comb and cover plates. However, there are times when I only require the reed plates. This can save on shipping costs because reed plates can be sent through regular mail.

You do need to be careful to package them in a way to try to avoid damage or loss. If you just drop reed plates into a plain envelope, I probably will receive an empty envelope with a hole in it.

Here's a safe way to package reed plates for transit by regular mail. Please be advised that although this is a great way to package them, regular mail is a lot less safe than sending them as a parcel with insurance. I cannot assume responsibility for list or damaged goods. It's up to you to make the choice whether the cost savings is worth the risk.

Step 1 - Place the reed plates back-to-back. Make sure the reeds are on the out side of both plates.

Step 2 - Wrap them up in wax paper.

Neatly fold the paper around the reed plates.

Step 3 - Use wide packing tape and stick the reed plates to a piece of cardboard. Make sure the reed plates are under a "bubble" of tape and completely covered.

Step 4 - Repeat the process for any other reed plate sets you are sending. Position the plates so they are parallel and centered on the cardboard.

Step 5 - Cover the first piece of cardboard with about piece of the same size. Make a sandwich.

Step 6 - Tape it up. Wrap the tape around the cardboard in both directions.

Step 7 - Put the cardboard sandwich into a bubble envelope and you are ready to send it!

  • Read more about Sending harmonica reed plates by mail (the safe way!)

French Tuner™

By Andrew | 11:43 PM EDT, Sat July 26, 2014

The French Tuner™

You don't need bulky, expensive and complicated equipment to tune your harmonica with great precision. The French Tuner™ helps you use your mouth and ears to quickly tune the blow reed plate of a diatonic harmonica. The French Tuner™ helps you eliminate beating and provide smooth chords.

  • Read more about French Tuner™

Research and development of optimized combs

By Andrew | 11:20 AM EDT, Mon June 16, 2014

I have an ongoing process of quality improvement and I devote some time and resources for research and development on certain projects. I've enlisted the help of a number of players to do some testing. I need the input of different players to determine if a particular change to a comb design is indeed an improvement that can be measured.

In cases where the improvement is felt across the board, the change becomes part of my standard design.

In some cases, the change is subjective. Some may love it while others may hate it. In that case, I can offer the new feature as an option so that customers can get a truly customized comb, made to order with or without any desired design tweaks.

I recently had some testers compare two combs. Both were identical except for the hole spacing. The Hohner Rocket boasts wider spaced holes and I wanted to provide that experience without making the comb tines too thin.


Wide openings and standard openings

The tines are only thin at the opening and become a normal spaced channel to provide less compressible volume a little further down. This is to improve responsiveness. The hole openings are 40 per cent wider than standard Marine Band comb openings.

Feedback is trickling in and I am considering it carefully.

My next test will involve resonance chambers. I feel the consensus is that thinner combs offer better response because there is a smaller compressible volume between your lips and the reeds. But thicker combs offer a larger resonance chamber and some prefer the tone of a thicker comb. Here is not-too-thick comb with enlarged resonance chamber. The aim of this design is to get the sound of a thick comb with the responsiveness of a thin comb.


Comb with built-in resonance chambers


Comb with standard shaped tines

I will be looking for more testers in the near future. I need to finish getting feedback from the first test as well as tweak the "resonance chamber" design before I call for more testers. Stay tuned!

***Update 2016/05***

I have come to the conclusion that resonance chambers have no real benefit and some drawbacks, namely that they can interefere with the performance of some bends/overbends. The original, classic comb design with straight chambers provides the best, smoothest performance.

Although this doesn't result in any innovation, it does provide some helpful evidence as to what makes a harp play well. I believe this project was time well spent.

  • Read more about Research and development of optimized combs

Acrylic (Plexiglass) harmonica parts

By Andrew | 3:56 PM EDT, Sat May 17, 2014

Acrylic is horrible on the environment to make in terms of the chemicals that are put into the air but it is sustainable once it is produced. It can be recycled or re-purposed. That being said, my community does not recycle acrylic. It goes into landfill.

So when I stumbled upon a small amount of discarded Plexiglass, I decided to give it a new home. After some tinkering, I found a way to produce some pretty nifty combs and French Tuners!

Once the sides are flat-sanded for air tightness and the tips finished to a smooth matte surface, they look like they are made of ice. Canadian-made ice combs for sale!

I am offering these combs at budget prices. They look terrific, offer quick response and sound great, but they don't offer the same juicy timbre as my Dark combs. They are most certainly a huge upgrade from stock combs and will add some punch to your harps.

If you want a comb that gets the job done at an economical price, this is the comb for you.

Limited quantities available. Click here to order. (Sold out!)

  • Read more about Acrylic (Plexiglass) harmonica parts

Playing a harp while giving out advice

By Andrew | 9:56 AM EDT, Sat April 19, 2014

My wife says I look like a clapping seal.

Yes, I do.

Front
  • Read more about Playing a harp while giving out advice

M1.6 Tap

By Andrew | 4:20 PM EDT, Sun April 06, 2014

A Marine Band 1896 harmonica is held together with nails. You can convert it to all-screw assembly. Fasten the reed plates to the comb without having to use nuts by using a tap to make threads into which you can turn a screw. This tap is for 1.6 mm screws.

A pilot hole for this tap can be drilled with a 3/64" drill bit - that's a commonly-available drill bit in the US and Canada.

  • Read more about M1.6 Tap

M2 Tap

By Andrew | 4:18 PM EDT, Sun April 06, 2014

A Marine Band 1896 harmonica is held together with nails. You can convert it to all-screw assembly. Fasten the reed plates to the comb without having to use nuts by using a tap to make threads into which you can turn a screw. This tap is for 2 mm screws.

A pilot hole for this tap can be drilled with a 1/16" drill bit - that's a commonly-available drill bit in the US and Canada.

  • Read more about M2 Tap

Video: Replace Marine Band nails with screws and install new comb

By Andrew | 9:09 PM EST, Sun March 02, 2014

This is a quick and easy way to install a flat comb in to a Marine Band harmonica. The stock comb has dimples to make room for the ends of the rivets which hold the reeds. My combs provide more surface area to make an airtight seal with the reed plates and the rivet ends need to be flattened.

This is a harp in the key of G. The end result is a fantastic harmonica that is loud and responsive. I was happy with the instrument but was not satisfied with the 4 overblow due to the shape of the reeds (out-of-the-box profiles).

I spent a few minutes and did some re-shaping of the blow and draw reeds to make them more efficient. It's much more work than just gapping. But the end-result is a 4 blow that is not tight and plays normally with hard pressure as well as a solid - and bendable - 4 overblow.

Front
  • Read more about Video: Replace Marine Band nails with screws and install new comb

Other models including Marine Band 364, 365, pre-MS Meisterklasse, Seydel Big Six, Easttop 008

By Andrew | 11:01 AM EST, Fri January 31, 2014

Made to order.

Models currently available for immediate production include:

Original Hohner Meisterklasse (pre-MS)

Marine Band 365 (Convert to screws)

Marine Band 364 (Convert to screws)

  • Read more about Other models including Marine Band 364, 365, pre-MS Meisterklasse, Seydel Big Six, Easttop 008

Lee Oskar

By Andrew | 10:54 AM EST, Fri January 31, 2014

Fits Lee Oskar harmonicas.

  • Read more about Lee Oskar

Suzuki

By Andrew | 10:52 AM EST, Fri January 31, 2014

Fits the following harps:
Suzuki Manji, Promaster, Suzuki Olive.

Also fits
- Dabell Contender
- Dabell Noble
- Suzuki HarpMaster, BluesMaster (*)
- Bushman Delta Frost(*)

The stock Manji comb is slightly smaller than the reed plates. My comb is a hair bigger than the plates so that the harp is more comfortable to hold.

HarpMaster, BluesMaster:

  • Read more about Suzuki
Pagination
  • First page « First
  • Previous page ‹ Previous
  • …
  • Page 6
  • Page 7
  • Page 8
  • Page 9
  • Page 10
  • Page 11
  • Current page 12
  • Page 13
  • Page 14
  • Next page Next ›
  • Last page Last »
Subscribe to Andrew's blog

User account menu

  • Cart
  • Log in

Custom diatonic harmonicas, Hohner Affiliated Customizer.
I customize Hohner Marine Band, Rocket, Special 20, and Golden Melody harmonicas.
Andrew Zajac, Kingston Ontario, Canada.
I use a continuous quality improvement process. I use regular evaluation and incremental steps to strive for constant improvement.
Website, text, photos, videos, download documents, designs and products by Andrew Zajac are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Terms of use

Copyright © 2026 Andrew Zajac - All rights reserved