I've always been under the impression that there are no adjustments of any kind on the clutch. My "Model Year 1984" manual (USA) has an overview of the clutch and control system and includes the following statement regarding the 201 clutch:

"The upper clutch pedal stop is no longer on the pedal bearing bracket, but integrated in the clutch master cylinder"

The line drawing shows a rubber bellows cover over the master cylinder pushrod, so I can't tell if it's adjustable or not, but to me the statement implies that there is no adjustment, and like a typical brake master cylinder I assume that the piston retracts to a snap ring or some other type of mechanical stop built into the master cylinder.

Duke