Hi Brian,
Here you go.
I cannot find my vernier so just check the diameter of the pins you have that go through the thing.
My links have a little steel moon shaped 'shoe' in the bottom of them as a wearing surface. I am not sure if this is original or someones addition. I am not sure if they are meant to be moon shaped or flat topped either. It is all rather worn.
These shoes have a blind 5/16 UNF thread in them.
The links are cast or forged parts so about 1" 7/8 across at the parting line and more like 1"3/4 at the edges where the taper runs out.
I think my measurements are ok but all the links on my Dexta are rather worn.
Hope you can read this...
Edit: It was raining windy and horrid outside so the piece of paper was rapidly turning to mush..
Rob