[Boatanchors] Where can I find nuts/lockwashers for Erie feedthrough caps?

[Michael D. Harmon]

I have a box with several dozen Erie feedthrough caps, most are 1000 pF, 
a smaller number are 500 pF.?? The threads are 1/4-28. I've scavenged 
them from cannibalized gear over the years.?? Most of the time, the 
chassis were tapped and the feedthroughs were just threaded into the 
hole, so there weren't any nuts or lockwashers to be saved.?? The few 
nuts I have are very small in diameter, not much larger than the nuts on 
an SMC connector.?? I would like to be able to reuse these feedthroughs 
for RF projects, but I never been able to find the nuts and lockwashers 
normally used with them.

Does anyone know where I could find some of these small nuts and/or 
lockwashers??? I've tried McMaster, but all they have is 1/4-28 machine 
nuts designed to be used with a 7/16" wrench.

Thanks!

Mike Harmon, WB0LDJ

mharmon at att dot net