yes that type I may have someone do itWhat kind of leads? Just remember on vintage braided that the outer braided part has to be connected as well. I've used a piece of bus wire to do it since it was easier than sliding the outer braided part over a piece of heat shrink tubing over the hot wire.
yes that type I may have someone do it
....It's easy. Slip a piece of heat shrink on one end (or you can use electrical tape after you solder), solder your two hot leads together and then slide the heat shrink over the exposed wire that is now soldered and heat it with a lighter to shrink it tight. Then wrap your bus wire around the braided snug and and run it to your extension piece and do the same thing and solder both the wraps and check for continuity and it should be good.
Also, stagger the cuts/splices so you don't end up with a HUGE thick wad of shrink tubing that won't fit through openings in the body.
Extreme example is installing ape hangers on a motorcycle with internal wiring.... my bars are 16" tall, and the splices in the electrical cables span about 10" of that.
Pickups obviously don't need to be done to that extreme, but 4 splices plus the shield is going to be double or triple the thickness of the original cable, so you do want to stagger them.
If it's 4 conductor (I'm a little confused which one you have, that or braided), just cut a small piece of heat shrink tubing for each of the plastic coated strands and slip those on first. Solder each of your wires to the right one on the extension piece and then slide your tubing over the bare, soldered joints/wire and heat them. The bare ground wire doesn't need any heat shrink.
Listen to the two people who've recommended replacing it all. It's the same amount of work and you'll be much more pleased with the outcome.