Well, today, I installed new tip and a 4/0 cable lug and 500 amp. ground clamp on my new-to-me spot welder. WHOA OR TRIPLE WHOA! This beast is just great. I am an old guy but love new toys and this thing really impresses me. I 'spotted' some nails together as well as some bed rails. This beast is going to find lots of use around my playpen.
Now, I determine that a spot welder should be a necessity.