Late reply, but maybe still helpful…
The rivets for the hook pass through the composite mast tip and into the aluminum insert of the mast head/sheave.
Replacing the hook is simply a matter of drilling out the rivets, taking off the old hook, and riveting a new one on.
To drill out, use an oversized drill bit, about 3/8” diameter, to remove ONLY the head of each rivet. If the rivet starts to spin, you can also use an angle grinder to grind the head off. Note that you don’t need to be especially careful about avoiding damage to the hook since it’s being replaced anyway.
Once the heads are off, you can use a 3/16” diameter straight punch to drive the shanks into the mast. Then install the new hook with rivets. You may also want to use rivet caps during the installation to help seal the mast. Either way, be sure to seal everything with silicone caulk.
A note that you shouldn’t need to remove the mast head for this repair, but if you do decide to remove it for some reason, be very careful not to damage the mast when doing so. The mast head may be tight and/or glued in. When tapping it out, there is risk of cracking the mast, so use caution.
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