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Tony,
I'm leaving for NEAF in about an hour.
I don't see anything unusual, the rings on the disc are normal. It's interesting to see that my sanding marks on the disc, after 5 years, are still there. it gives you an idea of how long the disc will last. I found a new source for the disc that are much flatter, so I no longer sand them. The rings in the picture are from the screw holes and are completely normal. I'm not sure why they're there, I sand each hole to make sure it's smooth. But there in every single mount.
It's very hard for anything to get in between the disc. If sand does it will lodge itself in the disc and make a new ring. My guess is the small peace of metal came from the platting hole that can be seen in the picture. There's a similar hole in each disc, that was used for the electrode to support the disc during platting. We have found another way to hold the disc so no longer put the hole there.
I don't advise taking the mount apart, you can cause serious bearing damage if it's not reassembled properly. I can't remember ever giving instructions to anyone before. My big mount (8.5" disc) which is 40 years old hasn't been dissembled since I added encoders when the Sky Commander first came out 15 years ago.
I'm out of here! Scott want's his DM-6 so I better deliver it to Him (at NEAF).
Tom
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