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Sometime in the next year or two or five I am planning on replacing some sheet metal on my classic car (1967 El Camino). I've been watching craigslist and came across a good deal. What are some things to check for when buying a used welder? Did all the 130s come ready to hook up to gas? After some searching it seems like there are / were issues with the drive rollers. Is that an easy fix?
Look for signs of abuse. Make sure the sheath of mig gun is in good shape, look for tight lugs for the ground clamp and gun lead. Inquire about what the PO used it for and have them estimate how much wire they ran through it. It will likely be completely off but it gives you an idea of how it was treated. I would definitely strike and arc and see how it runs. Do the knobs work to adjust wfs and voltage?
I would also consider a mm140 if you can find one for a good used price. Also, I think the drive rollers are on back order right now but miller is working on getting them back into production and probably will by the time that you purchase your welder.