I have an old Gandy Big G. It has Simonis 860 cloth and plays really well. The pockets, however, are buckets and VERY forgiving. I would like to make the pockets smaller. Can this be done with new rails and changing the angle of the pocket cut? I really don't want those spring-loaded shims but I guess I could do that if that is the only way. Also shelves are very shallow. Any way to make them deeper?