Okay, I have been reading post for hours to see the best way to change out a bad rotary switch. I couldn't find much of anything about the welder I have, so I need help. The machine I have has 5 positions 0,1,2,3,4,5 and 12 terminals and 3 sections. I purchased a szw26-20/COA.5 which is a 5-position switch 3,1,0,2,4 and 12 terminals and 3 sections. It was the only switch I could find that was close to what I have. Any knowledge of how to change over to this new switch would be great. I have limited skills with a meter, but am very handy, so I think there is hope for me getting this done with some coaching. Machine says made in Italy if that helps. Also has a number of some sort on the front E-13554/90