Put that plastic cap back on and maybe the nut won't loosen itself while you ride. And you won't have to use thread locker.
However you are the first I've ever read that is having a problem with their nuts. Or at least the little nuts on the presta valve stem. <grin>
If you had to come up with an alternate solution, then what about a small diameter rubber or plastic tube you can put over both the nut and the smaller part of the stem. Maybe the insulation from some larger gauge electrical wire.
Last edited by Iride01; 03-11-22 at 11:47 AM.