When compared to turning tools commstones are easier to use, more time effective, and remove less copper. 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. 2 in X 1 in X 8 in, Grades F/P, Commstone, Pocket Combination.
For best results, use a stone with a width equal to or greater than the width of the brush. Brush Seater, 4-3/4 in X 1/2 in X 1/2 in, Grade Ms Our Brush Seaters come in 5 grades: ES EX tra Soft, FH Fine Hard, MS Medium Soft-our most popular, FS Fine Soft, and MH Medium HardBrush Seaters are used to easily and accurately seat commutator and slip ring brushes of any material. To use the Brush Seater, hold close to the brush so that Brush Seater material will be carried under the brush..