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Yes, there is a flanged bush going through the central hole and there is another flange at the front. The front flange has a thread for attaching the baffle. The mirror's location is defined by its back face and its internal diameter. The front flange also has a silicone rubber O-ring that pushes the mirror gently into contact with the bare aluminium flange on its back side. I may add a very thin shock absorbing layer, but definitely not something as rough and agricultural as cork.
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