Keep on Rivettin'
I think I may have an answer to the problem and I appologise if I have caused any confusion.
When I said anneal, that means to heat the rod up to cherry red and then let cool. When the flame is off the copper it looks a dark red and when the flame is on the rod it has a shiny appearance. You can let the rod cool down slowly or quench it in water to cool it quickly. It will not effect your material.
Because it is non ferrous i.e. copper or bronze it will work harden as you form it.
When it work hardens, then you need to anneal it, again. It is not necessary to have the rod red hot when peening. Now if it was a steel rivet, that would be different.
Steel rivets were/ are heated to near 'white hot', not to be easy to form over, but to ensure that the shank of the rivet fully fills the hole. You can actually knock a 0.75" rivet head down cold but it will never be tight in the hole.
Let me know how the rudder goes
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