There's a lot of discussion of this kind of thing further up. the thread, I think Coldharbour might have offered their design for sale, and Fairbairn did this: https://www.lfgss.com/comments/14124326/
Thanks for digging this out. Exactly what I'm after. I still have my Talbot light mount but it was for my mudguards.
Edit: that instagram is dead. time to keep digging...
@JB started
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There's a lot of discussion of this kind of thing further up. the thread, I think Coldharbour might have offered their design for sale, and Fairbairn did this: https://www.lfgss.com/comments/14124326/