[R-390] 4:1 Vernier drive knob assembly

[wa4aos at aol.com]

Hi,

I am looking for a ?4:1 vernier drive and knob assembly used on the 51 J and 75 A receivers. I had heard at some point a machinist had constructed some out of brass. Anyone have a nice one they are willing to part with?

Thanks

Glenn WA4AOS
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