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To detach the motor from the handle: 

1. First loosen the safety pin about three quarters of the way.
2. Then slide and hold this button to the unlock position as you twist the motor apart from the front handle. 

To refit the motor:

1. line up the locating slots, push the motor in and then twist it back all the way until the button clicks into the lock position.
2. Now wind the locking pin all the way in to finger tight.