Well we have a few Sterling expellers where I work and we have changed the set ups on them many of times. Well for the Sterling 500 we have almost a whole replacement set of the worm pieces. They are De Smet Rosedown parts. I also have a bunch of the lining bars for these machines. These are a tool grade steel and I don't know how they would work for people forging and knife making. I will get a few pictures on monday so some of you folks can see what I am talking about. Thanks, Matt