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well i have tryed everything i can lay my hands on to clean this corrector plate ,hydrogen peroxide mix with ammonia ,alcohol,bleach,acetone,vinegar
have not done the sard as yet john i will that ago .I have even let these soak for 5 days both sides before giving it a detergent wash iam stumped.Astro you only have to line up the secondary mirror centre this is done with cork shims because it is circular it does not need to go in any one position
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