I'm a little late to the discussion, but this may help. I sanded down a piece of cedar (one of the nice smelling closet cedar things - I liked the color) and attached it with removable 3m strips. It looked like crap, but it allowed me to re-position the sucker. I kept it on for 3 months, and finally decided I didn't want a thumb rest. I pulled off the 3m strips and now I'm set.