1. Wash all parts in extractive gasoline.
2. Connect one clamp of the homometer to the rotor shaft, and the second to the corresponding sections of the commutator. resistance equal to "0", indicates a short to ground.
3. A scratched or burnt commutator must be re-sharpened and sanded with sandpaper.
4. Move the insulation between the sections of the switch to a depth of 1 mm
5. The minimum length of the brushes is 13 mm.
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