Is there a ground rod clamp with a threaded stud?

[Todd0x1]

That's going a long way to avoid a pigtail. (What's their objection?)

Honestly I have no idea but this is one of those clients where you aren't being paid for your opinion (unless you are) and you give them what they ask for.

 

[Todd0x1]

Can't you use a water line grounding clamp, then attach a single lug to the hub where the 1/4-20 screw is? Maybe replace the Philips head screw with a hex head so you can grip it better?

I'm sure some water line clamps are listed for use on a ground rod

The screw situation on those doesn't work out for this.

 

[Todd0x1]

I would have cadwelded the cam lock to the rod with a short piece of conductor.

It would have been nice to just take the contact from a double setscrew inline camlock and just drop it over the rod and tighten the setscrews......