Spent an hour or so on the lathe making a new one out of HDPE on the lathe. Screwed up the first one.
I had to make it from sheet stock because there wasn't any round stuff. Eh, it works great though- much less sloppiness in the pedal now. I imagine that it will be 100% if I can ever figure out the correct way to get the rest of those linkages to the right lengths and tensions.