[Roadsters] clutch slave

[Tim]

Yesterday I tried to adjust the clutch slave on my 70 2000. It has no 
play so I am hoping that a proper adjustment might stop the slippage I 
was getting last summer before my back went out (and laid me up until 
late winter).

My problem is the adjustment and lock nuts. I was not able to get these 
apart. I soaked them with penetrant but can't get a good grip on the 
lock nut. A 12 mm wrench was too loose and started to round the corners 
and I could not get an 11 mm on it.

Suggestions? I'd rahter not pull the whole slave if I can avoid it.

Thank

Tim