On the subject of welding aluminum with the little SP125 Plus welder
and the liner kit what I did was order another gun and cable and the
aluminum kit. The kit was a lincoln but the gun and cable was made by
an American aftermarket company. I don't remember their name but the
new gun and cable appear identical to the Lincoln made one. Anyway,
it's easy to change the cable/gun assembly on the SP125 Plus. Just a
thumbscrew. So if you are going to be welding both aluminum and steel
it might be worthwhile to cough up the 100 bucks or so for the ability
to easily change back and forth.
Eric