Martindale Commutator Cleaner and Brush Seater, 4-3/4 x 2 x 1-1/4, Fine Hard
For brush seating, choose a stone with a width equal to, or slightly greater, than the width of the brush. For cleaning commutators, pick a stone about 3/4 the length of the commutator bar and as thick aswill neatly fit between the brush riggings. For slip rings, select a stone about 1/2 in. wider than the ring.
Grade: Fine Hard
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