Prop shaft separated from gearbox

[scottie]

I only posted that picture to show the grubscrew as an example. The split-clamp coupling is not the same type as the OP's.

The vertical screw / Bolt is for mainly location purposes rather than drive

 

[Poignard]

The vertical screw / Bolt is for mainly location purposes rather than drive

Exactly what I have been trying to say.

In fact, once the clamping screws are tight you could take the grubscrew out without it making any difference.