Thanks Ken; that link was where I found the drawing (on the next page, where my "one word" was located).
I then had a quick look on Aerofiles and it would have been one of those perfect challenges, with the Bromon entry having no mention at all of this project and only a passing reference to the Ahrens 404 project and that was misspelt!!
I'll put something up shortly (as kitchen duties permit)
