I've got a 1970, GS 455 and I need to rerplace the turn signal cancelling cam. I already have the part and have seen other threads about how to snake the wires etc. My question is how do you get the horn cover/button off of a 3 spoke sport steering wheel without breaking something? I've tried the old push and turn like I've found on some other cars, but this one doesn't budge. I tried to carefully pull the rubber center off to possibly expose the screws/bolts, but it seems like it might rip.

Any advice would be appreciated!