Aha, the throwout stop!....
Way back before some of you lot were born, the early 850 Minis didn't have one.
In normal operation it does absolutely nothing- I drove a Mini for years without one fitted.
Its purpose is to stop the clutch from throwing in too far and overloading the thrust washers. Without one, this can happen- just imagine what happens if you dump the clutch, then immediately push it in again. If the fluid is a bit sluggish coming back thru the hose, the clutch arm may not come right back- what happens is you are then pumping the clutch, and each successive push of the pedal will stroke the clutch release further in.
It is the LAST thing you should adjust. Loosen the nuts off, make sure the arm stop screw is set where you like it (I don't measure the gap- I just set it to give 20-25mm free play at top of pedal) and THEN have someone push the clutch in once and hold it, screw the nut up finger tight and lock it with the locknut.
Whether you turn it up 1 more flat or undo it 1 flat (as I do) is up to you.
Enjoy!

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
