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Ok, the head of the bolt is stripped.
Before you go too much more with changing the bolt, put a little WD40 under the bolt head, and a little time for the oil to seep in. It will help loosen the threads and ease any damage that may have occurred. I'm talking a drop of the stuff, not a squirt from the can. If all you have is a can of the stuff, spray some onto a bit of plastic, or some other surface, and pick up the liquid from the material that's pooled. Any excess on the hub can be cleaned up when you remove the bolt & secondary mirror. You won't be putting on so much that it will coat everything! Just a drop. Dry lubricants won't seep down the threads where you need it.
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