The Hi-Matic 9 I have, had a thin line broken, and other than it being very thin, it repaired nicely.
I believe when I got this camera, the lens was also fiddly and it appeared to me to be the screw design, but tightened properly, it all came together well.
The Hi-Matic 9 was an up market follow up, to the 7 and it's later model.
It's "lovely" to handle and shoot, though a bit large, and the lens was well appreciated by many reviewer's post.
Go slow during the rewiring phase, as it will require your full attention, even if only for ten seconds and reassembly.
I seem to recall that this broken wire was a design flaw, as it would work itself up into the len's mechanism where it was pulled out or cut, so first look at some old rangefinder reviews and the Rangefinderforum.com to see the skinny on that model.
Good luck!