I have a heavy-duty massager whose main structure is held together by two
pieces of threaded rod about 3" long. The rods are partially stripped at
the ends; nuts need to be turned to put them on, but they're quite loose. It
doesn't look like it would be possible for me to replace the rods, so I'm
wondering if there's any sane and relatively permanent way to repair the
threads. Whatever I use has to tolerate a LOT of vibration, of course.

--
Britney Spears' Guide to Semiconductor Physics
http://britneyspears.ac/lasers.htm