I'm working to remove the fill valve from my (quite old) Kohler toilet. Drained the tank, unhooked the water supply, now trying to remove the locknut. Trouble is (and forgive me, I'm not sure if this is common) the locknut is plastic and two pieces that seem to lock together. So when I attempted to unscrew it, the lower half of the locknut came off (as it kind of unhinged from the top part), but the upper half of the plastic locknut which is up against the porcelain just won't budge. What's the trick to getting that last piece off? I've tried using a wrench but I'm afraid of damaging the plastic or the porcelain. Thanks!
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