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Re: Loose A key

Author: Chris P
Date: 2021-08-16 21:33

If the throat A key had some lateral play in it and that was swaged to make it a perfect fit, then that can do a number of things which cause binding.

Either it was made to be a perfect fit between the pillars and is binding up with changes in humidity levels, or it was swaged to be a perfect fit and the swaged end is binding on the rod screw, or there's a burr on the swaged end which is being caught when the rod screw is fitted.

Signet and Bundy clarinets have a short needle spring for the throat A key which needs to be balanced well in order for it to work. If it's too weak, then the throat A key will be unreliable and made worse if the key is a tight fit between the pillars.

All cross mounted keys need a tiny bit of lateral play between the pillars to ensure they function under any conditions.

Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.

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