I have a 1897 Winchester that’s in need of a new firing pin lock spring. It’s the old style flat spring type. Any ideas on where a guy could locate one? I might need the lock itself as well as the ones I’ve seen a picture of have a dimple that keeps pressure outward on the spring. I need to look at mine again. I don’t recall seeing that dimple protruding out. Any help would be greatly appreciated. Already tried the usual parts sites.