One of the 3 hinges on my side door is making a loud noise as the door opens and shuts. Hard to describe the sound, but looking at the hinge I think it might be the 2 washers in the middle rubbing against each other. It's not a squeak, but a much lower pitch almost grinding sound. I squirted some silicone sealant between the washers which alleviated it a bit. I thought the hinge might be binding, so I tried undoing the screws which attach it to the frame to see if that freed it up but it made no difference. There doesn't seem to be any adjustment on these either, no screws or allen bolts, the hinge pin is just plain flat top and bottom. Any ideas what might be wrong and if there is a way to adjust please?