So was that just a co-incidence?
Having never seen or heard about a Model 7 Service Manual even existing,
within Three weeks of asking one turns up on Ebay!
I think we can all now comfortably assume that a Service Manual
will probably exist (or at least existed) for the Model 40 as well.
Maybe the same Genie can magic up a Model 40 Service Manual during the next Three Weeks!
No harm in asking!
Hopefully, since the Manual fetched a decent price, it might encourage any other surviving examples to come to light.
Ian