Originally Posted by stevieturbo

The pedal-master needs adjusted so there is no slop in the mech.

You cannot pre-apply pressure to the master without risk of pushing it over the fluid supply hole. Do this and when the pedal is released, it may not drain back correctly to the reservoir. If you do, it can trap pressure in the system causing the release bearing to push against the clutch, leading to slippage and other problems.

It'd take a hell of an overpush to damage most covers ( but yes it could happen ). And you'd feel under foot that you're doing this.