http://machinmania.blogspot.ca/2013/08/a-letter-written-by-warboys.html https://www.google.ca/search?q=1974+Octagonal+Machins+by+Derek+Worboys&rlz=1C1CHBF_enCA762CA762&oq=1974+Octagonal+Machins+by+Derek+Worboys&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8
http://machinmania.blogspot.ca/2013/08/octagonal-machins-continued.html
Hi Maybe this might help! Rich