... model1 004 336 801,09,10,13,14,20,21,27,28,31,42 51,53 937,38,51, ... appears scratch, rough, ablation and so on. (2) With a good flow properties and set to change commutation , so ... brush performance Commutator: Unit must be in good condition, with less than .002" out-of-roundness. Bar edge must ... of "d" on the double shank terminals may vary with the flexible size, reducing as the flexible size increases ...