Brush Saver, Commutator One End = C, One End = M Designed for smoothing commutator on small motors and generators.This non-conductive tool allows user access to resurface commutator to a smooth finish, which eX tend brush life and improves commutation..
Commstones should be twice as long as the width of the longest flat spot and as long as will work freely between adjacent brush sets.1 in X 2 in X 8 in, Grade F, Commstone When compared to turning tools commstones are easier to use, more time effective, and remove less copper.