By the way, I thought I had seen something about this on the www.concertinaconnection.com website, and I have just found it here, in the section on the Geuns-Wakker 30 key Anglo Concertina :
I'm not suggesting that solid metal buttons cause "problems", only that lighter keys are a little easier on the fingers, as well as saving on overall weight, and that the old makers felt that this was so.
We use Wheatstone type keys on all our concertinas: wooden core with a metal sleeve.
The top of the keys can either be flat, domed or rounded depending on preference.
Because of the wooden core, our keys weigh only a fraction of the solid type keys which are used by most makers nowadays. Lighter keys mean faster and quieter action
For that matter, they also have those buttons available as spares here.
Edited by Stephen Chambers, 25 July 2005 - 01:25 PM.