Do not know if you can see much detail from the attached pic, but the Contemporary chassis I picked up had the pin drive hubs that were drilled and had a 'D' shaped pin to hold the centers on. Someone had discussed this on a thread a while back and still had some of the pins, but they would not be that hard to fabricate if you wanted to go that direction. I guess another option would be to drill and tap and use a counter sunk set screw like some use to hold the 'decorative' spinners on(?)
