[Ol' Relic]

Wire sheath? As in, the plastic casing of an electrical wire? How would you attach that?
I really do appreciate your help guys. I'm sure I'm not the only one with these concerns.

If you get the appropriate gauge wire (don't ask me what that is ), it'll just stay in place by friction after it's forced on. The sight globe will prevent it being disturbed even in a gun case.