68 Cuda Heater control plastic pieces ?

I had a friend turn brand new one out on a lathe, they are made from cutting board plastic and then I took the whole control appart and replaced the center with a plastic 7/16 bolt from a toilet seat. When I got it tight enough I then took a brad nailer and shot a pin through it so it could not turn then cut the top off the plastic pin. I have installed it back in the car and works like a charm.