A thread chaser is used to "chase" debris from threads. I have one for Browning and Bennelli and have never used either but did use one on a Remington back in the day.
I know Loctite also makes a thread lock that is designed to allow you to remove the "bolt" I thought I might give that a try but never did. It was suppose to be soluable with a number of cleaners and sounded like just what a loose choke tube would need but never tried it.
Another automotive thing I want to try is the carb cleaner we used to use. You would put the old dirty carb down in the stuff for a couple of hours and when you pulled it out it was as clean as new. I thought that stuff would be worth a try getting plastic build up out of tubes. If I remember right it was real expensive and probably against the law now.
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T.J.
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