40C radial arm saw

by Tim Horner
(Sacramento, CA)

I'm rebuilding a 40C radial arm saw, and need an arbor nut. Does anyone know a parts source? I haven't had any luck on-line. I could also substitute a different nut, but I don't have a thread gauge to measure it. I think it is reverse thread. Could I substitute a nut from another manufacturer by matching threads? Thanks!