"How about shrink tube like we use for wiring?" Excellent suggestion! Perhaps even 2 or 3 layers of it shrunk independently. I had been trying to think of a solution that used epoxy in a tube or similar but the chances of some of it seeping through to the inner wire was a hitch. The shrink tube stuff would never do that and as you say, is strong. Well done! And as an added bonus, it is not permanent. I have a philosophy regarding classic, exotic or antique cars; "Make no irreversible changes." I try to follow this right down to the stupid level. However, I was the ONLY one at a recent discussion, who had the original '73 SAAB 97 oil pan bolts (stored away in a baggie) that were needed to make a restoration a 100-point car! (Not my car. I just still had the bolts...)
Best Wednesday! Rick