I'd expect that those who play lightweight concertinas, standing up, wouldn't care. But for large Duets and baritone ECs, that pretty much have to be played sitting, it could matter a lot. What do you say?
Most of the tinas I have photos of, satisfy the requirement, that the handrest bar is perpendicular to the flat side that faces the floor during play. On a hexagonal box, this implies the handrest is centered across a vertex, but on an octagon, the bar is parallel to a flat side.
Thanks, Mike K.
Edited by ragtimer, 01 September 2009 - 10:06 PM.