In effect hot riveting through the screw holes. If you've got 100 year old screws best chance of a colour match...
Got a photo if it, trying to pick out what a (t)A is, a (f) I get and a (t)...
And edit there, I've seen the heating part done with a careful hand using a tig torch as an electric arc heat device on the screw head - was rather efficient, very quick and very little fuss.
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