When I had an SP 170 (excellent machine by the way) I was going to convert to euro torch,By either making or buying one that fitted into the original SP 170 clamping system with a euro connector on the outer end, No mods required toi the welder casing,
I know the machine only goes down to 30A, But i could weld less than 1mm lap joints with a continuous run, no trigger pulsing. Also according to TechnicaL, the welder characteristics are good for mig brazing,