Apollo 15 rocket repair

[macvolo]

I am trying to repair the apollo 15 rocket. The problem is that the rocket lift does not work because the cam on the crankshaft is not fixed and turns, so when it is in contact with the lifting mechanism instead of pushing it it stops, despite the motor keep spinning, I hope I have explained.  How could I fix it?  Or at least fix the cam to the crankshaft?  I try to attach photos

Thanks for help