I've all but dismantled my gearbox casings, to get them vapour blasted. However, I'm foxed by the steel pin that holds the clutch operating arm. I can't see a screw slot. Are these pins threaded, or driven in / out? I'm reluctant to reach for my Birmingham screwdriver...
Try to support the boss halves with a hose clamp and shims between the lever and the boss if necessary, they have a nasty habit of breaking off if the pin is stuck and hit too hard.