Janis,
Let me know, I'm curious too. I do like the cam machines, they are fun to make stuff with. There is over 30 different flat cams to find and play with.
Grant,
In the 600 series possibly, but I had two 413s, a 457, a 518, and a 538 with plastic gears. They work but those gears are not near as durable as steel. Obviously.
Joe