Step 9Optimize the Motor Mount
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The next trick is to get the gear for the fan and the gear on the motor to line up so that their gears mesh. This is probably the most difficult step of the entire process. You may have to drill additional holes in the motor mount, or re-position the motor in order to get an optimal mesh. I had to change the gears I was using at this step because I found that the differences in the gear diameters was too great to allow the pinwheel to still turn freely.