With the wheel truing stand I have, it utilizes “cones” that are inserted into both sides of a wheel hub that allows for the wheel to be spun and checked for out of round, or true. The cones supplied with my stand work with most wheels, but the rear Excelsior wheel hub is pretty large. So I needed larger cones. Off to my machine shop for help. A few hours later we were all set and I could now use the stand with my rear wheel.