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Air tight: how important?

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  • 2 weeks later...
On 4/5/2023 at 2:29 PM, Stephen Chambers said:

But personally I don't believe in drop-testing of concertina bellows because the heavy weight of the dropping end is creating a not-inconsiderable vacuum inside the concertina that's potentially harmful to delicate glued structures of thin leather, felt, fabric, and cardboard.

I would have thought (but don't know) that the pressure from letting one hang would be far less than the pressure & vacuum created during playing, even if you had a button pressed during playing.

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