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most of the damage occurred on a micro motor is on a burning brussed because chances are there's broken and connected between the vcc and ground.
If you have damaged other micro motors no matter the size of the different length provided that the diameter of the circle by the same you could use the brush it. (micro motor found in 9gmicro servo).
but you can also make it from plat conector thin, small plates and cut lengthwise (copy another form of brusshed /damage typically on one side only) connect a small wire using a soldering iron. replace the bad conector with a new, be sure brussed to stick to the conector shaff motor on each side and carefully lest bruss connected with other hand bruss.