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I bought the mount used off Astromart Steffen - it was built in 2006. The only place I can think of for 'grit' to come from is that threaded hole in the alloy discs (one in the top disc and one in the bottom disc); I did get some loose metal out of that hole and there did appear to be a couple of small pieces embedded in the white disc. The scraches/scour marks may be completely normal - I won't know until Tom looks at the pictures and he is away at NEAF for the week.
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