[Ron Ramirez]

Forgot to mention:

Rebuilding a tone control is no harder than rebuilding a Bakelite block. It involves removing the capacitors, which are encased in a hard waxy substance, and wrapped with thin fiber which has the electrical characteristics of fishpaper (i.e. an insulating material).

I like to reuse the fiber material after getting rid of the old capacitor assembly, to ensure the new caps are insulated from the metal case.

Of course, there is more to rebuilding a tone control than this. I'm afraid I don't have time to explain fully at the moment. Anyone else, feel free to chime in.