I just noticed something is missing on my Knick; see photo of the forend latch. For all I know it'e never been there since I got it. Everything seems to work fine. The part of the Parker latch next to it isn't slotted like a screw head; don't know if the Ithaca would be the same. Questions: 1) How is it installed? 2) Is it important? 3) Can I get one? Thanks...