Coincidence! I was just thinking about this project again, I printed the whole thread out so I could review it tonight, then an email notification pops into my inbox. Cool!

Here's the CAD drawing I have of the wheels. As I read the caption, there's some info that is a little confusing to me, so it will be to all of you also. The main thing is that 1 has a wide gap, 1 has a narrow gap, and IIRC the one gap needs to be narrowed with a file.

I'll try to dig this stuff out in the next few days and re-familiarize myself, maybe I can explain it better.