Inside the car I'm ok with the crimped butt connectors but elsewhere I prefer soldered, but the twisting together and soldering can be a pain and doesn't always look professional. Who makes uninsulated butt connectors where you first crimp on the wire, then solder it for a perfect connection? I think it has small holes so the solder flows throughout. Thought maybe Mercedes or BMW sold these years ago to make factory approved repairs to damaged wiring.