I got rid of mine with that many knobs, now I must cry myself to sleep at night, I solt it for 300 dollars too, I only payed 100 for it, so yeah, I just needed it gone cuz I was moving.....wahh, I miss my welder, I one welded up a cylinder head that got messed up by the surfacer, someone didnt install the puck just right....it cut 1/8" deep across a complete combustion chamber, I fixed it, they resurfaced it, it ran....I WAS EVEN SHOCKED, I miss my tig welder....now I must go cry