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A good press fit will be needed to secure the parts. Using a hydraulic press on a motor shaft can be tricky as you don't want to bent the shaft at all. Either thread the adapter to 12mm and use a jam nut or grind two flats on the adapter 100 grads apart then secure with 6mm 9.8 grade set screws. You may need to separate the gear from the motor at some point. The people at the mechanic shop may have some good ideas too.
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