Re: occ chopper hub adapter question...
Don't quite understand the problem. Is it the center of the sprocket that you are having the problem with?
I used the stock rag joint and sprocket without modification, on my first OCC. Used it for a year then went 5-speed.
I have also used m-m adapter on another Occ, again no problem.
If you do go with the rag joint, take your time and get it right.