Got the JMJ Mustang yesterday and it’s great but both positions of the thumb rest don’t do it for me. I’m more of a Leave me thumb resting on top of the Precision pickup kind of player. Unfortunately you cannot do this with the smaller and shallower Mustang pickups so at the moment I have just put a small circle piece of rubber that has sticky stuff on it that was in a drawer from years ago and it does the job but I’d like to get something more permanent and screwed into place.