Hi Leigh:
Despite my tightening the screw on the GND lug with needle-nose, it was
loose after I soldered it. I don't know if it will get loose again.
Perhaps I have the washer in the wrong place.
For what it may be worth, I used a flat washer on BOTH sides of the plastic
case (up against the case itself). Then, I used a hand-held socket to
tighten the nut. Using the flat washers allowed me to apply a higher amount
of force to tighten the nut since they spread the compressive forces out of
a slightly wider area of plastic.
I also used two flat washers between the nut and the thumbscrew, so I can
sandwich the wire between the washers and not have the thumbscrew try to
expel the wire as it's being tightened down.
I also used a slightly longer screw and then used a pair of heavy-duty wire
cutters to impart a 'bunged-up thread' right at the end of the screw. this
keeps the thumbscrew from being accidently unscrewed and lost.
73,
Tom N0SS