Some of the most amazing machines do have nylon or plastic camstacks. I've been working on an old White with a perfectly good camstack - the machine is metal otherwise. I love the machine - it has 3 needle positions and a nice variety of stitches. The camstack was meant to be changed out but I don't know where you would find a different camstack for it. It has a door in the back of the machine for the cam stack to come out. Then on the front it has a removable/changeable stitch design chart. Makes me think you could change it out if you had a different camstack. It has some kind of electronic box on the bottom of the machine for the foot control. I don't understand that one but the machine works just great.