A friend of mine says he recalls seeing rigid 75-ohm coax cable connectors that are several inches long and would be inserted through a wall, leaving the threaded female connector end sticking out on either side. They'd be just like the common cable couplers that are are about an inch, just much longer. Now that I think about it, I'm a little dubious because there would need to be a number of different lengths to accommodate various wall thicknesses. He is certain he has seen them somewhere, but now that he and I could both use such a thing, we can't find a shred of information. Has anyone heard of of these things?
I know about feed-through bushings (available in black or white), of course, but was hoping to avoid having to acquire the tools to do my own cutting and termination.