I agree.  I have a K3 boxed up that I should sell.  I just took out the thumbscrew and measured it, although my eyeballs are still calibrated, and it measured 0.137", i.e. 6-32.

On 8/23/2025 9:55 AM, Jack Brindle via Elecraft wrote:
Interesting. Perhaps AI isn’t all it is being touted.

According to the K3S Manual, the ground screw is a #6-32 thumbscrew, Elecraft 
Part Number E700070.

As I recall, it is at least 1/2” in length (probably 3/4”), but it has been a 
long time since I had the ground screws out of my K3s.
It also has two #6 flat washers on the shaft.

I would note that the same thumbscrew is used on other Elecraft products.

73,
Jack, W6FB


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