In article ,
Andy Dingley wrote:
Sure it's not the old 7/0.29 copper which was tin plated? Have you cut
it to see if it's copper in the middle?

I'd suggest _not_ cutting it.

I meant at an end which was being worked on - the OP stated he was
adding sockets. Sorry not to state the obvious. ;-)

--
*I don't have a solution, but I admire your problem. *

Dave Plowman London SW 12
RIP Acorn