Good find on that site. I will check into buying things from there.
When I got it, it was missing all of the internal torch pieces, so I replaced them all with brand new pieces A,B and C. D was in good, clean shape, and the holes weren't clogged. I don't have a lot of experience with PCs, but my friend / neighbor does and came over and helped me check it out.
I'm confident that this rig was abused, since the guy who gave it to me owns a welding shop. So with that assumption, what could go out on it after years of random guys in his shop not using it properly, or touching it to the metal or trying to cut material too thick?
I'll try it again this weekend on a scrap of steel to see if anything changes. I'll take pictures of the rig too, if you think that'll help.