I was working on the lights on the dump truck and wondered how those Made in China lights ever got the DOT approval..My soldering gun burned out the tip and I realized I hadn't shown my grandson how to fix it. Weller tips cost about 5 bucks the last time I looked. Years ago a friend showed me that you can just use a 4 inch piece of # 12 or #14 solid copper wire.. bend and install it. after you use it for a while the copper gets soft and you have to tighten up the nuts..I always solder and shrink tube all my wiring. even with crimp connectors.