I have just realized that the way you guys have been saying to hold your thumb on the back of the neck has been hurting my wrists. I have always read on here that you thumb should be along the neck, horizontally, straight along the middle. When I play like this, it hurts my wrist because I have to bend at an odd angle. I have also watched video's of Geddy Lee, Cliff Burton, Les Calypool, and many other bass "Gods", and have been paying attention to their left hand techniques. They are nothing like this so called "text book method". When they play, they shift their thumb to go along with their fingers, to hit the frets, their thumb is actually curled over the top of the neck a lot, which I have always been told is a bass no-no. I have been paying a lot of attention to this lately, and tried adjust my technique so it wouldn't hurt my wrist. I have found out that the mehtods I have read about here actually hurt my wrists. Just figured I would point this out. Maybe I misunderstood you guys?