"Ian Jackson" wrote in message
...
In message , Charles Hope
writes

I've never heard of soldering the central core to the centre pin of
the
plug. I was told to use fine-nosed pliers to crimp a slight kink in
the
core so it will make good contact with the inside of the centre pin.

oh dear.

I've only kinked the inner when I didn't have a soldering iron at
hand - and then it was a sufficiently kinky kink to require a very
firm push to insert it through the pin.

I've rarely been able to get the inner straight enough that it didn't.