OK GREAT, thanks Mario. That gives three examples, counting in Feltwad's flint conversion to caplock.
I have seen a modern gunstock carved to better allow a right handed shooter ease of laying the head across the comb of the stock to use the left eye when shooting. He was a Korean War Vet, right handed, right eyed, lost the right eye, but wanted to continue deer hunting so had his gunstock modified to allow him to do this. I wondered if a person shooting a flinter in the 18th century who lost their right eye, would have to learn to do the same (perhaps not with the stock change) to shoot with the left eye rather than have a left handed flinter made.
Just pondering, and thanks for the information.
LD