If you use the MEW drawings make sure you READ them thoroughly first.
The base section is incorrect as drawn. It shows the clamp thread hole going through the mounting step. Look at the photo up and right in the article and you will see where it should be. The CL is 10.50 mm from the face oposite the step.
David has been e mailed but these things take time to be published.
But it does work as I have made one from scrap bits. I am pleased with it for the amount of use it will get it is a good infill job and has saved me from “collecting” another expensive instrument just in case I might need it.
I also got a 2nd vernier from Aldi so that I can have a settign on one and the other for free measurements.
Regards Clive