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i got a new 27t motor for my rc10t and no matter how tight i put the set screw for the pinion on after like 5 mins its slips off. the set screw isnt backing out what can i do to fix this by 8am tomorrow iam outa ideas.

Rough up the motor shaft with a file??? Might work. How do you know the screw isn't backing out a little? I would use loctite on the screw and see if that helps.