This is a modified fixture for the Renesis tapered side seal. I added screw holes to mount it to a piece of wood. There is an 11.1mm hole at each end to grind the proper angle on each end of the tapered side seal and the slot for shims like the original. I added the RX-8 logo for easy identification. I found some 10mm grinding bits to use and they work great.
The author remixed this model.
This has a longer tapered slot for the RX-8 Renesis longer tapered side seal