Hi Dunc,
not sure if I understand your problem correctly. There is a small booklet by Bradley, named ‘Shaping Machine and Lathe Tools’ . My issue is from 1976 (5th reprint it seems). It even has a ISBN number: 0 85242 485 X. Published by MAP Technical publication
I. Bradley wrote also another book ‘The Shaping Machine’ , also by MAP, 1973. ISBN 0 85242 323 3
MAP and Argus are the same.
Now if my memory is not totally corrupted, Mr. Bradley was one half of the Duplex team???
If you are interested in a shaper and have the room for it and can get one cheaply, then take it. Otherwise it is by no means a necessary machine, just ‘nice to have’. There are quite a lot of websites about shapers and their uses. Now where did I put these green pills which have such a good effect on my memory?