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Old German Concertina Restoration

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Hey all, I've been working on restoring an old Concertina I picked up at an antique shop, and one of the (many) problems I'm running into is what the button caps are made of, and how they were put together. I attached an image below, does anybody have any knowledge on this, or spares available I could pick up?


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Maybe zinc, or galvanised steel? Is it magnetic? They were pressed from discs using a custom die set. I have an old blog post about how I make mine:




If you only need a small number it would be easier to turn something similar from solid bar. Aluminium would work but would look a bit different from the originals.

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