Repair/frankenbinding Riva cable?

[BEVL]

Got these skis off kijiji recently and was really hoping to get out skiing them next week (new to telemark and just upgraded from xc skis to these + scarpa T1s) however when I was messing with the cable this nut suddenly seized and I haven't been able to move it despite all the finger+plier strength I could muster. Anyone have ideas to fix/cobble together a repair for this? I was thinking of carefully using a Drexel to cut off the nut then replacing it with a regular hex nut if I can find one that fits. The bindings are Rivas with the side heel throw.

[fgd135]

Did you try some light oil on the threads? Might oil it, let it sit overnight, then try again.
You could also email or call Neptune Mountaineering in Boulder, CO; their ski repair shop sometimes has replacement parts for older bindings--yours, however, are very very old.
Finally you might try to find another used pair of bindings on fleabay, for parts.

[phoenix]

I have a spare cable for that binding, but not the nut (surprised it's that frozen). You can have it if you still need one.

[fisheater]

It wouldn’t take much heat to warm that nut up enough to draw oil inside the nut. I buy PB Blaster locally.

Low flame, heat the nut, squirt oil both sides. A little more heat. I would try to turn it hot. You could let it sit, even overnight.
I have had fittings not come apart, at least in operable condition.
Those fittings look clean, odds should be good you can turn them.

[phoenix]

Looks like the threaded section is slightly bent, I wonder if that's part, or all of the problem? Otherwise fisheater's method should work.