Larry,
I've have used one of those Davis Late English locks. I purchased it at Friendship about ten years ago, and as I recall I looked at 2 or 3 of them and picked the one I thought looked the best. One had a screw or two that appeared to have been a little off center.
I modified the tail somewhat for looks.
It won't accept a real big flint, but has it functioned well in limited use.
Jeff