So, I’ve bought a serial cable that I knew was wired up wrong, with the intent that I’ll need to rewire it for it to work correctly. I open up the box on the RS-232 connector and I see that there is heatshrink tubing over the soldered connections. So, how do I remove this? Easy, just use a razor blade to cut away at the tubing, it is designed to be very soft and pliable to the razor blade, then pull it away with a pliers, tweezers, or whatever other simple tool works best for you.
20190429/DuckDuckGo how to remove heatshrink tubing
20190429/https://www.hunker.com/13414418/how-to-remove-heat-shrink