As you can see from the pictures, it is rusted between the brass fitting and the inner steel shaft. Even if I buy a new one it will happen again. What are your experiences with this problem and what are your solutions. The last picture is of my McDonald's Senior Coffee cup and PB Penetrating Oil. It melted. WTH, if it would hold coffee it should hold Penetrating Oil. Oh Well, I took the shaft to my buddy's house and we are soaking it in Evapo-Rust Remover from Tractor Supply. The shaft turns the Fine Control, Amperage, Rheostat on my Miller 250 NT.