This is a pressure fit replacement for the hour hand of an Echo Wall Clock.  You will need to press the reset button 5 times to get the central spindle to move all the hands to noon. Once that is done, just pressure fit the new hour hand and then set the clock. The model does not have a notch (could not get a printer to print with enough detail to make it work, even with a .02 nozzle.) so alignment is critical. It stays in place so unless you remove the hand you will not need to reset the clock again.