Not much to my surprise, my hack-job thermistor rebuild went bad:

Having nothing to lose, I heated the brass tube over a butane flame to wreck the epoxy, which blew out with a satisfactory bang and filled the Basement Laboratory with The Big Stink.
Much to my surprise, the active ingredient still worked:

The multimeter reported absolutely no intermittent dropouts for as long as I was willing to watch the trace while doing other things:

So it must be my crappy soldering technique.
A brace of real M2 thermistors will arrive shortly …
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