Custom Harmonicas by Andrew Zajac
The most expressive harmonicas

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There’s no mystery left in custom harmonicas

By Andrew | 5:03 PM EST, Mon December 01, 2025
  • Andrew's Blog

Diatonic harmonica customization was much harder when I started because there was so much bad advice.

Some claimed you could get complex results from a single vague maneuver, with no real understanding of the actual problem.
It’s rocket science, but don’t worry, they’ve cracked it. You’re welcome!
And when it didn’t work, most folks blamed themselves and thought they were bad at gapping or bad at embossing instead of realizing the suggestion was flawed from the start.

Others treated tuning for harmony like a mystical achievement. A feat reserved for the elite. Something you might reach only after days of delicate labor.
Like climbing Everest.

Today, there’s no mystery left in custom harmonicas.
It’s easier to find something when you know what you’re looking for.

You can do this.

It’s not rocket science.

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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.
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