After I posted I started to look at the McMaster Carr on-line catalog and have just about come up with the same idea though was looking for some internally threaded tubing and male Heim instead, but will probably settle on what you did. Those Lokar cables are nice, but in my case as well as yours, wont work so it's back to the tried and proven.

What did you use for that insulation material? I think I have some .125 sheet Buna-N that might work.