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The set screw is usually a M2 allen head. Some can be 1.5 too.
OR 1/16" SAE.
You want to tighten it until it stop (do not force) and then unscrew from 1 to 2 turns. That is a good starting point.
But I think that your problem is related to the motor instead. Sounds like it is the motor pinion that got lose from the motor shaft. It usually will create a very high pitch noise, like a grinding sound.
Too tight motor will make a high pitch, but sound like gears a lot more. Too far will make a lower pitch that sounds like sand is in the gears (crunching kinda sound). Farther and the motor will just free-spin with barely any noise.
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