Originally Posted by
Alan Davenport
Another way, similar to the O-ring but more solid, is to use a piece of electronic solder. Just cut a piece a bit longer than the circumference of the hole it must fit in, then fit the solder around the hole and cut it off to make a complete circle (no you don't heat it.)
Solder is about 60% lead and 40% tin, so it will deform a little when you tighten things down, and everything ends up nice and tight. Make sure you use rosin core solder so there's no danger of corrosion. Solder that is used for plumbing and sheet metal work typically has an acid flux core, and isn't recommended even though you won't be melting it and releasing the flux.
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