The stop-cock to my house has been locked solid, but after diligently applying lubricant twice a day for a week it now rotates freely and works fine.

I now have a different problem, how do i lock the gland nut in the correct position? If I tighten the gland nut to the point where it no longer rotates freely then the stop-cock no longer turns, if I loosen the gland nut to the point where the stop-cock turns freely then the gland-nut turns with the shaft and quickly tightens itself to the point where both the gland nut and the stop cock won't turn.

Access is very limited, if I loosen to the gland nut too much it leaks, the whole stop-cock is covered with so much oil that loctite won't stick, and I don't want to risk smearing any plumbers mait on it for fear that I'll end up locking the shaft up rather than just the gland nut.

Any suggestions?