I know some people use glues, epoxy, j.b. weld etc... And than use paint , markers etc.. to blacken the grip...
Through repairing and building instruments accordions, concertinas,in my fathers business I worked with a lot of celluloid (these instruments are covered in it.) I use celluloid to make grip repairs . It is very tricky and takes time ,but the repair cannot be detected in any way..Be careful, the brass pins bugger easy.
Not bad Mr. Sword Fish
