The spindle that connects the crank arm to the motor has a screw on it. Remove that and look at the spindle. There are three holes. Each one slightly further from the center. The furthest is the longest stroke.
The spindle that connects the crank arm to the motor has a screw on it. Remove that and look at the spindle. There are three holes. Each one slightly further from the center. The furthest is the longest stroke.
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