[Richard Farrant]

Originally Posted by Lynn Eades

Bruce, in Britain's defence, that hideously grotesque, user unfriendly, engineering nightmare, called a grease gun, was probably conceived during a rubber shortage.
Its primary function was to distract German engineers from their work, while they pondered what it was and how to use it.

I have a feeling this grease pump is a postwar item and part of the kit for a tank (maybe Cent?) and that is why the pipe line is designed in such a way that it stowed neatly.