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The motors come in a 300:1 and a 500:1 version. You don't want to mix them obviously. The black cap used to denote a 300:1 and a white or silver cap used to denote the 500:1 model. Who knows with China made stuff today. Best bet is to use a mirror and get the numbers off your existing motor. Usually the 500:1 motors are for larger slides.
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