I remember there was a guy out toward Hartebeespoort who knew his way round props... Just not sure how one would find him. Maybe someone on the forum could remember his name and location. But you could maybe ask round the boating shops specifically for the dude at Harties.
As far as skeg goes, I have an old Yammie 4-stroke and the skeg was busted, so the prev owner just bolted on a skeg protector to fulfil the function.