If you don't have a grinder, you need one. If you have some salvaged auto parts, you can make o ne!
Sturdiness and accuracy are incorporated in this inexpensive, roller-bearing grinder, which you can make from an junked auto differential assembly.
The grinder will take wheels up to 12 inches in diameter, and it can be made either into a floor or bench type. The work can be done with orginary tools, with the exception of a turned wheel shaft, which is substituted for the axles. The gearing and axles are discarded.