Awesome build, and a first rate job. I hope you continue to make more.
I'm in the process of making a friction drive, ordering parts here and there like you. Question: Can you explain the drive roller a bit more, and provide a few more pics of it (if you have more)? Specifically, if the drive roller was 1/2" to begin with, how did you get the one-way clutch bearings in there, and it still fit over the drive shaft?
Hope that makes sense, thanks.