Thanks both. It works on a push and pull basis. Essentially when you turn the knob one way it pulls the inner cable which in turn pulls a lever at the plug end and the plug pops up (or down can't recall which way around). When you turn the knob in the opposite direction it pushes the lever at the plug end and the plug does the opposite.

I have both solid and stranded core to try once I get the mechanism working..

Sounds like I have to somehow secure the outer sheath to the brass fittings.. Any ideas?