In message , Harold A
writes
Would it pay to take the cover of the junction box and make sure the
three brass screws are good and tight? (after turning off the power, of
course (-: ? ...I've noticed that those brass screws on electrical
fittings often seem to develop some looseness somehow, over the course
of time. Anyone know why that is?

Copper does spread over time under pressure.

There's no harm in doing what you say, but be careful not to overtighten
as that can cause problems too.

"Well made off" = properly assembled.

--
Clive Mitchell
http://www.bigclive.com