Install the Roller guides as shown in the illustration. One side should have a 1/2" spacer, and the other should have a 3/8" spacer plate.

Tighten the bolts snug, but so that they can still move up and down.

Replace the drawer as if you're going to stretch the cylinder again.

The roller bearings should be on top of the rails on the drawer, and be putting no pressure on the drawer.