A friend of mine was telling me that there is an attachment that fits onto a mig welder and turns it into a spot welder. Somehow it goes on the wire feed end, you place it to where you want the spot weld and pull trigger, count to three and release trigger. Say's it makes good welds. Never saw one, went to NAPA and there tool and accessories books shows nothing like it. I need one to do the body work on my corvair turbo car since everything body wise is unit body spot welds. I have a stick AC/DC stick welder and a mig welder so really don't want to buy a spot welder if I don't have to. Anyone seen one or better yet have a photo of what one looks like?