Engine 2014: Electricity

1. A a file for cutting the approximate curvature followed by sandpaper for the final fit
2. B using fine sandpaper on a deenergized machine between the brush and the commutator to establish the proper curvature
3. C emery paper for the initial cut and crocus cloth for the finishing cut
4. D course lapping compound, followed by a medium and then a fine grade

Tip: press A-D to answer