[R-390] Source for plastic washers for rack mounting

[Terry O'Laughlin]

McMaster-Carr in Chicago

http://www.mcmaster.com/

Do a search for countersunk washers. They have them in natural and black 
nylon.  Somebody makes them in a gray that's perfect for R-390s, but I've 
never seen them for sale.

Terry O'
WB9GVB