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Note on the "black bumperette": The inner part where the screw goes in has a tendency to crack off from over-tightening the screw. When you take it off, look to make sure it's not cracked or broken without you knowing. If broke when the screw comes out it will fall out the back of it. It's easy to re-glue, not so easy to find a used replacement whole and/or cheap. I added some glue as a coating on the one I had that wasn't broken.