Rubber sheeting? What?
Use two fingers.
Position the rings on their notches. Now when you take your two fingers and squeeze, you will see the ring ends move. You want them to stay within those notches in the ringland.
Anyway, if you know the proper ring placement
Squeeze the rings with two fingers pretty hard, and rotate the cylinder left and right.
The thing to look out for is that you dont want to catch a ring end on a boost port, so get the first ring on and squeeze the second ring, and slowly push it through.
Haha dont forget your gaskets
Then you can throw a stud in if you need a brake, If you just want to get it done keep going.
make sure you oil your gaskets lightly with 2stroke.
Put the cylinder on then - while your holding that with your left hand - slide 1 stud through the head, put the head gasket on the head, then throw that on the cylinder and put the rest of the studs on.
Make sure the gaskets are on the right way.
You dont need anything special.