On Fri, 5 Jun 2009 21:22:33 +0100, "john royce"
wrote:


I have one of those small LED pocket torches (flashlight). To turn it on
and off, I have to screw the end up towards the bulb end to compress the
contacts against the battery.

The thread in the screw end is an extremely 'loose' fit and tends to
'unscrew or scew up' when it sits in the car glove compartment for a
while.

Is there a way to *stiffen* this 'loosness' in the thread, without
reducing
the electrical conductivity?

Bend one of the threads a little bit. Not one at the open end. One 3
threads back, so that you can still use the good threads to start
screwing it on, and they will be enough to pull it on when it gets to
the bad thread.

If you don't do it enough, you can do it more later. (make sure it is
meant to screw on that far.)

If you do it too much, you should be able to clean up the bad thread a
bit by twisting a screwdriver in the groove.

It needs to make good electrical contact for the torch to work, so I guess
that rules out putting a dab of wood glue on the thread? Thanks for
any
advice.