At the risk of prolonging the discussion. 6-32 Thumbscrew on Amazon
appears to be the exact one Elecraft is using.
I bought a 4 pack to have spares. From "The Thumb Screw Depot."
https://www.amazon.com/gp/product/B09FZNJ52Y/ref=ewc_pr_img_1?smid=A1AFNJJFLAFKUA&th=1
John, N1AU
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