It's something I've been wanting to make. I now have access to the machine shop at school since I'm now taking a machine design class. I'm meeting with my instructor on Tuesday to talk about how to make this. I currently have a 7.5" crank pulley and a 3.2" SC pulley. At 7000rpm the SC pulley will be at 16,406 rpm. I've found a sealed self aligning bearing rated at 17,000. I have yet to look in loads but hopefully this will work
http://www.skf.com/us/products/beari...did=1140112200
I would like to find left and right threaded rod ends that I could press these bearings into. The Paxton pulley uses six 5/16" bolts that thread in the dampner. I have an idea of using a 3" or 4" OD solid aluminum rod and turning it down so that there will be a lip making it centric with the pulley. The Paxton adaptor plate is just like this. I'll then bolt through it like the rest of the pulleys. The adaptor will be turned to accept the bearing and a retaining bolt. The SC side will just need a quality spacer and longer bolt. The rod between the two will be simple.