Hey, thanks for the suggestions.
Having a nice long shaft
![Shocked :shock:](./images/smilies/icon/eek.gif)
is good to go through thicker panels. Not essential in my case though.
The ones in the ebay link look a bit like the ones Naim used to fit to the back panels of their olive range power amps.
Having them insulated is a definite advantage as I can then mount them through aluminium plate.
I suppose the purveyors of expensive foo would have you believe that the expensive ones are worth the money. But are they really ???