Revolva compensates for back focus by design.
As long as you have a Revolva cartridge fitted, back focus will be correct.
Bear in mind that temperature, knocks and bumps and other factors can affect back focus for any given lens and camera.
Adjusting backfocus on DSMC2 is simple, so you should collimate prior to shooting whenever absolute precision is required.
Shims for Revolva PL, RF/PL and RF/EF units are available by request for Ranger and Komodo users.