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Matt,
Raul (Team 111) posted that he used .001" press this past year on the CIM motors. I do not like to use a press fit because all my gears have had an outside diameter greater than the .75" boss diameter. Pressing on means disassembling the gearbox in order to change the motor.
Have you considered gluing the gears on? With a key and a light slip fit, a liitle bit of loctite would secure the gears and still allow disassembly.
Andy
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