Interesting stuff here. I like those soldering pliers and the low temp butt connectors. Most of my work has been putting ends on the wires. I wonder if they make low temp loop and spade connectors.
I use standard crimp connectors from my FLAPS. They are cheap and work well. I cut the plastic "insulator" off and crimp them to the wire, then solder them in. I put two layers of dual wall, adhesive lined heat shrink tubing over it.
I needed an eight foot section of heat shrink tubing to finish off the VW wiring harness I was making, plus about a foot for the Porsche job. Had to buy a 50 foot roll for $30+. Anybody need any 1/2" heat shrink tubing?