I have a hozelock reel model 2415, could do with swapping over the inlet
and winding handle between sides to suit using the wallhanger in a
different position.

The assembly instructions helpfully say that it's a one-of choice and
cannot be altered

https://vimeo.com/125556317

It looks like four alignment "prongs" and four plastic hooks hold the
handle in place and other than being awkward to get at, should come
apart with suitable persuasion, any one tried and succeeded (or failed)?