Right, been playing my new-build concertina for nearly a year now and an interesting problem has come up. When I pul, the strap is pinching the flesh between my thumb and index finger against the top of the handrest. It hurts. I've tried alleviating the problem by angling the "point" of the concertina more sharply against my thigh, in order to move my hand out of that position, but my big right mitt stil gets caught. If I take it up a hole, the strap is too tight for me to get all the notes. Any ideas for simple, non-invasive strap/handle mods?