Maybe try wrapping the threads with some tape made for sealing pipe threads. I don't know which would be the best but they make them for air, water, and gas pipe connections. Not sure if something like Locktite of pipe dope would work, but is another possibility.
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"The more answers I seek, the more questions I find."
Screw it together, then use electrical tape on the outside (at the joint) a few winds should do it, it will not unscrew in use & you can easily remove the tape for storage. Guaranteed or double your money back
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