Incidentally, building the fillet in to the curve before revolving is one way. But if you work in a parametric CAD system, like Solidworks, you are taught not to do that. If the fillet is a separate feature, it is easier to go back and amend it, rather than change the base sketch. Not so relevant for MoI but worth noting.

Thanks All

I will retry with a Revolve, thanks for taking the time to explain.

So far it's been a real it's been a real pleasure working with MoI and posting/reading on this forum.

Cheers, Steve