Discussion
Which service does a worn commutator require?
Answer: C
A commutator is skimmed true and the mica undercut so it does not stand proud as the copper wears. Light polishing genuinely does refresh a lightly worn surface, which makes the last option a real if limited remedy. Replacement is required when the diameter reaches its limit. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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