Very good observation Dave,
Haven't given much thought to this before now!
I remember Paul posing a similar question in a past post - see link below
http://www.bocn.co.uk/vbforum/sd2-fuze-question-t20455.html?t=20455&highlight=fuze+size
Pauls link was on the 41 fuze with threads - now this I would expect to be standard on all bomb bodies as thread would be uniform- however the shoulder or top of the fuze could possibly have a greater diameter without affecting the fitting on this type.
The bayonet type fuze however is another matter, its the fuze head that is critical.
Am I right in thinking that the main part of the fuze body fits into the bomb body ok and it is the shoulder of the fuze that is the problem? (by shoulder I mean the widening of the top-not the two lugs used to locate the fuze into the bomb)
I have fuzes that I can fit in fine, but come to take them out again and its like a chinese puzzle, so exact is the fitting.
I can only assume that there are subtle differences in the shoulders and the tolerences are so fine that a minor difference of a few mm would mean that a fuze would not fit.
However like T-mine has pointed out the Germans are so precise with engineering that I doubt it was something that was overlooked.
I am trying to get as much information together as I can on complete 'untouched examples' to see if any manufacturers were combined in the assembly of the units. If this were the case then it would explain the minor differences in manufacture.
As for wether different fuzes of the bayonet type had different bodies, I would doubt that very much, the tolerences are just too fine. I think it would be more obvious in such a case.
I also have noticed on the bayonet type bomb body that when you try to insert a fuze with the clips attatched to the side lugs it is nigh on impossible to twist it round. Granted it would be a tight fit and a special tool was probably used, but on something as delicate as these fuzes the fit seems extremely tight. I've cleaned out the recesses to shiny metal and they remain impossible to twist by hand. I know that they would only be needed to fit once but always thought myself that this fit was extreme.
Not really helping much with your 67 though. Will have a look at the different bayonet fuzes in my collection and put them in different bodies and see if there are any apparant differences in the ones I have.
Great question you posed Dave
regards
Kev