Need Pax-side front wheel spindle nut 1940

[pauldridge]

Anyone know the size of the castellated nut that holds the brake drum to the spindle for a '40 Sixty Special?  I seem to have partially stripped the threads on mine.  Possibly this would be a standard off-the-shelf item at a specialty hardware source, or even auto parts store, but could use the correct size and thread pitch.

[Jay Friedman]

According to my '55 Master Parts List the thread is 3/4 - 20.  The left (driver's) side nut is left hand thread.  The nuts were the same from 1939 to 1955 and probably later.