Are you saying that your clutch is not opening or closing or that it is sticking while opening or closing?
I assume you have checked your rollers, roller washers and roller pins, unless you take it all the way apart you can't see the roller pin, there is a chance it is worn out, have you replaced your weights or the weight pins. The weight pins can bend which causes them to swing away from center as they open/close which pushes them into the side wall of the spider as they roll on the roller, they can also wear into and catch the wall of the outside sheave where the pin goes through the weight.
There are so many possibilities. Get back to me.
