I've been playin BG for a while, and have got quite involved with the school band. I'm now in the wind ensemble, where I'm expected to play a DB. (for every rule there's an exception, and it's often me) They just got the bass out from storage, and I've been practicing with it, you know findign the right notes and learning the technique and stuff. The problem is, my right hand keeps cramping up by the thumb joint. I'm using a french bow, and have my thumb slightly cuved in the little pocket, with the tips of my fingers on top, except the index is flat on top. I was told by the band director, who knows alot about orchestral technique that it's just because I've been playing it for only half an hour, and I'm asking my hands to do things they havn't done before. Is there anything I need to be concerned with? Did you have thumb cramping when you first started DB? Thanks!