most OS's that I have run across have a taper on the bottom oof the sleeve so that it compresses the ring has you push the sleeve down over the piston. After installing the crank, I put the piston and rod in, and then rotate it so the piston is at TDC. Usually you can see to make sure the ring is lined up with the anti-rotation pin. Once you are sure, begin wiggling the sleeve down over the piston and ring. I lube it up pretty good before I start all of this. With a new ring, it is all most impossible to get the sleeve over the piston if the ring is not lined up on the pin properly.