Been awhile, but I have been reading even while not posting. I just bought a new Jazz bass, converting back from a Precision, and I'm finding that I feel comfortable with my hand and tone while resting my thumb on the bridge pickup. The trouble I am having is that I feel pain quickly as my thumb puts a lot of pressure on the edge of the pickup. I'm wondering if anyone else has added a thumbrest in that area near the bridge pickup, or if there is anything (padding, perhaps?) to affix in the area to ease the pain in the thumb. Maybe I'm just a wimp, but I really do dig in quite hard with my plucking hand in that position.