best way is to take a nife or screw driver, place it on the inside of the clutch, between the rubber and the metal , give the screw driver/knife a quick sharp hit in a anti-clockwise direction, the idear is too turn the clutch quicker than the motor arm, this will undo it. to do it up again just place new clutch over threaded motor arm and place jug with a banana and milk, for a bit of ressistabce and turn it on, this will tighten it up nicely. Hope this is of help
Mixologytrainer, July 2009