The gear probably is intact There is no reason for it to be broken. put the gear in a vice and try turning the rotor shaft. use a pair of chanel locks with a rag or nylon grips. If the pin is sheared it will move. if it just feels tight by hand the sheared pin can hold because of excess metal being rolled over. This realy is the only ting that makes sence. Hope I'm wrong
Good Luck
Charlie