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Here is a close up look at the Corse Spline Count of a M-20 to M-21 Input Shaft. The Spline count has to match the input shaft. Of course they should not be a press fit. If you have a problem installing this onto your input shaft you will shit can y...

Here is a close up look at the Corse Spline Count of a M-20 to M-21 Input Shaft. The Spline count has to match the input shaft. Of course they should not be a press fit. If you have a problem installing this onto your input shaft you will shit can your Thrust Bearings in your motor.