Thanks Tim.

There were 3 rivets and the plate with the pulley had a lip which sat over the aluminum.

I have made a bracket/strap out of aluminum that is a little thicker than the mast section and was planning to rivet that to the mast in 4-6 places and place the hook back as was.

When compared to how it was prior, this repair should be a fair bit stronger, at least to my non-technical eye.

From what you've suggested though, perhaps I should use stainless rather than Al.

Cheers and Thanks.