Don't panic - the tall one is looking into it.
With no front prop on, you will probably find that the de-clutch shaft and front prop flange have been spinning round due to drag on the spigot shaft anyway.
With the front prop on, there may not be enough drag to turn it, so the spigot will spin in thge transfer box shaft. I'm just saying it could lead to friction and going tight therefore worst casde scenario the front prop may end up turning.
All you need to do is cut off the spigot which is shaded on the superb quality drawing below and problem solved (sadly no sectional drawings in the WLF manuals!!!).
Don't take the pee out of my drawing - I'm in a rush to cook supper before Mrs. NOS gets back, and she can be worse than a tired lorry driver sometimes about supper on the table oh b*gger she's just driven in the yard............