The pushrods usually bend because of sticky valve guides. I've polished the end of the cam with fine-grit emery cloth and used a little Never-Seez on the cam snout to ease the gear back on once the hub is heated. Just don't get it hot enough to damage the phenolic material if you choose to use the fiber gear, or better yet, use the aluminum gear. It can be heated in an oven enough (300 degrees or so) that it can be slipped on without hammering much at all. It's a slight bit more noisy, but it lasts forever!
Jerry
