[AMRadio] Knob needed

[Rick Brashear]

I am searching for a 2 1/2" fluted knob like those found on a Variac or
Powerstat control.  It needs to have a 3/8" shaft size.  There is a picture
of a similar one at the attached link.  I found one at a commercial outlet
but they want $20.00 for JUST THE KNOB!
 
Thanks,
Rick/K5IZ