Hey Pat, I recently got an eggpin to find the right angle for me before I get my bass drilled. After playing with it for awhile, I've noticed that playing in thumb position for while gives me back pain that I've never really experienced before. I know this may be hard to answer without pictures but do you have any insight to why this may be happening? I was thinking the angle or height may not be right? I seem to prefer having the pin angled towards the G string, like how Hal Robinson has his. Any advice you could offer would be greatly appreciated! Also another quick question unrelated to this: How exactly do you measure the angles using a protractor? Where do I line the protractor up? I've heard that having the pin straight back is 44 degrees or something? Is this true? Thanks!