So I am yet to see the key and tongues No32 scope tools for sale, either as originals or reproductions. Has any one else?

Assuming not I was thinking of taking the nice diagrams from PL’s little scope book and having a go.... my concern is that while I am an engineer by training it was in the electrical and electronic arts and sadly not in the mechanical discipline. Has any one made any of these and if so do you have any practical advice?
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