So we all agree that the longer adapter contained just one longer paper wrapped time fuse?
These must have been a special made fuse just for this application. Yes David it is a driven mealed powder fuse.
Joe, so you reckon the gunner would pull the lead seal and quick match, using the small spanner and remove the water cap, push the paper wrapped fuse out of the adapter, cut it to length then reassemble the adapter, minus the lead seal, screw it back into the shell; all in a gun room full of smoke and in excitement of getting another shot away? I guess it is possible but it doesn't seem to be a good idea.
Cheers,
John