On the bottom of the lock plate there is a small flat spot, probably where the casting gate was. I have noticed that some remove this and continue the bevel completely around the lock plate and some leave it. Which is correct?
Example Gun building, SquirrelHeart's Early Lancaster take 4, first picture, bottom of lock just in front of the pan. No reflection intended on SquirrelHeart that was just a picture that showed what I was referring to.