Working on a 1997 Road King oil pump with the engine in the bike. Is there a trick to get the oil pump shaft clip on? It's the clip on the outside of the engine, not the one on the cam side. When I try to put it on it either pushes the shaft back inside the gear or, if I get it hooked in the slot, I can get it about halfway on then it pops off. I don't want to stretch it out of shape.