How to Make a Vibrating Motor. : 4 Steps - Instructables
First, make sure that the clip can rotate around the motor shaft without catching on to any parts of the motor. Once you are sure of this, turn on your soldering iron and wait for it to get very hot. Once hot, hold it to the alligator clip for about 20-30 seconds. This should be more than enough heat to melt the clip's teeth into the plastic.
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