Zip tie the belt to both sprockets and as you take one off just let it flop, but still zip tied securely in 2-3 spots. As for getting the cam sprocket off, there is a spot on the actual cam that is shaped for a wrench. I am sorry that I cant remember the size I wanna say 17 or 19mm. You can put the ratchet on the bolt for the cam gear and the wrench on the hex spot on the cam. A twist will get it broken loose. It does take some force though.