Personally I thought the best solution would have been to thin out the liners at the stop pin. You wouldn't need to make perfectly square holes to the exact dimension of the pin for it to function properly. I think you could have just sanded or filed the whole section around the pin flat. But I understand that you probably wanted it to look normal and so that's why you avoided doing that. It may have also reduced the strength of the liners and introduced some flex, maybe?
Never mind. Disregard this.