This threaded stop is pinned to the handlebars, but does this mean it's riveted?  As in peened flat inside and outside?  There's no way the pin can go all the way through and not interfere with the cable, right?

Thanks Dave!  My handlebars were mangled on one side, the RH side, so I'm putting a new one in.  The LH side is original and pinned with one pin that is peened like a rivet I guess, and there's also a second hole opposite that but it's empty. 

I can't see how a pin all the way through wouldn't interfere with the cable routing, but where it was pinned at the bottom, near the center casting, the pin does go all the way through.

So I ask!  Pretty much decided to go with a pair of short pins on the new RH bar, and installing another short pin on the LH side where the empty hole is.

But I haven't done it yet!  And... it does seem like a pin all the way through would be more secure!