"Surely the type/weight/size of box will have some bearing on what you do with the bellows. Anglo/English/duet are very different beasts."   Exactly, Thinking of use of bellows is important, but there should be no dogma about it, for example,Alf Edwards made quite dogmatic staements in his tutors about EC bellows, which appear to be the opposite of how Ali Anderson uses his bellows, each to their own.