Movement. I notice you seem to have some experience on the Riso (Gr3770). Do you have a solution

Question

I notice you seem to have some experience on the Riso (Gr3770). Do you have a solution for this problem. I am sure you have heard of this problem many time if you have worked with the RISO in the past. Anyway, here goes. How can I keep my riso from moving all over the place when it prints? No 2 pages seem to come out in the same position. Each sheet can move up to 1/4 inch, forward or backward. I have cleaned the clutch and all the feed tires.I am semi-handi when it comes to repair, I just need a little direction.