Im currently working on putting my front bib back together after some restoration. I noticed that the hinge, which is not attached to anything, is very stiff. I cant pivot it at all with my hands. Im concerned if I attach it all, bib, hinge, frame, back together, it could bend the sheet metal on the bib. How stiff is it meant to be, I don't see where it comes apart. Should I spray some silicone grease in there and see if that provides some relief, or is it a lost cause, and should I seek a new one?