Hi Andrew,
I have some time to figure out the best way forward, but the following picture shows the result I want to achieve. A group in Poland fabricated the front drive sprocket/idler shown below using a road wheel with no tire and modifications to the wheel rim. Rethinking, just on a time basis it might be better just to just buy the burned wheels aftermarket set.
![[linked image]](http://dubliner75.smugmug.com/photos/i-SjRNrpB/0/M/i-SjRNrpB-M.jpg)
I had also thought about casing the outer wheel halves for the regular road wheels so I would only have to go through the trouble of getting the dished hub cap with it's bolt pattern right once, but I know there are other ways to solve the problem.
Regards, Chris.