That's pretty cool, but in an offical comp would it not be against the rules to stop the timer with your wrists. (if so, that could be a bad habit to be practicing)
Rule A6c) The timer must be stopped using both hands, with both hands flat and palms down. Penalty: 2 seconds.
Rule A6d) The competitor must fully release the puzzle before stopping the timer. Penalty: 2 seconds.