The concertina's ergonomics cry out for ergonomic improvement to make playing easier and music sound better.
This is one of my experiments - with some success. Advantages are:
1. Firmly anchors both the two keyboards, making playing easier.
2. Reduces the floppy awkward twisting of the bellows at direction changes (in-out-in).
See also my vids about (a) making the thumb straps swivel on just one bolt, to give the hands flexibility, ( removing the guard for the little finger, which makes for easier playing © shaving the tops off the buttons so they're rougher for better grip.
http://www.youtube.com/watch?v=a26xSS8VrP8
Bruce (Tomo) Thomson
20 Lyndhurst St.
Chelwood Village,
Palmerston North06
357 7773 021 176 9711
palmytomo@gmail.com