Need to remove the 1/4 hour gear/cam on the front of the movement. This is the four pointed 'star' cam that releases the melody each quarter hour. I assume it is pressed on. (Please be patient, I do not know the proper lingo). Movement is a Cuckoo Clock Co., mantel, spring driven, triple chime unit. I want to remove the minute shaft to replace the busing on the front plate and not damage anything as I don't believe replacement parts are an option. Then, how is this piece secured to the shaft when reassembled?