Mike Dodd wrote:
snip
Bugger. I have now searched for the infamous "noggin", and found the advice
alluded to above. My problem is that drilling a hole through the noggin
might be rather more tortuous than you might expect - have you ever seen a
component video cable with three moulded phono plugs attached Time to
find a 2mm drill bit and go noggin hunting I think.

Obtain a soldering iron, and some coax, make your own cabling up to length.
Often cheaper too, and no problem with fixed connectors.