In article ,
Jim Yanik wrote:

some snipping ...


Use of the light while unscrewing the tailcap is *not an operational mode*.
Who CARES if it works or not when you're unscrewing the tailcap?
NO one USES it that way.

I certainly agree with you on that score, however... The topic was
whether the tailcap to body electrical connection was a design weakness.
Clifto and I seemed to be in agreement that one *indicator* of that was
how reliable that connection remained as the thread contact area was
reduced. Clearly his test results and mine differ, leaving the matter
somewhat unsettled.





Apparently you and your colleagues are working in some sort of
corrosive environment, or perhaps the lube you're using is corrosive
to aluminum?


THAT's their problem;they let the insides get corroded,probably from no O-
ring,and/or immersing their Maglite.(or leaving the tail cap LOOSE....)


Maybe so.