You're likely thinking of a tap. While a tap can be used to clean a
thread, I believe it should only be used as a last resort. By design,
a tap removes metal in the process of threading... even though your KH
is already threaded you may end up removing more than just paint,
leaving the threads weaker than they were before.
If you haven't already tried solvents, wire brushes, etc., to clean the
threads, I'd suggest you give those a go before resorting to a tap.
If you're worried about damaging surfaces that you want to stay
painted, you can coat them with wax / paraffin before applying the
solvent.
If you do want to go with a tap, simply bring a screw from your KH to
your local hardware store and ask them if they can measure the threads
on it and recommend a suitable tap. You'll also need to get a tap
wrench... together the two parts should be $10-15 USD. Before using
the tap, however, I suggest you do a little research on how to use it
properly. It looks easy to use, but once you mess up with a tap it's
very, very hard to fix the mess.
--
maestro8
Those are my principles. If you don't like those, I have others. --
Groucho Marx
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