Faulhaber motors have a code on the back of them. Maybe you could post a picture of the motor. If it is a Faulhaber you can measure it a 1724 for example is 17mm in diameter and 24mm long. The other specs you may have to guess at, but if it isn't supposed to go over 9 volts like someone said, then you need a 1724( for example ) and the 9 volt model.


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