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ATM polishing



Hi, thanks for the advice. I have been working both with TOT and MOT . Also, looking at the Folcault image, at the COC, when the knife nulls the image, a bright thin cresent appears on the left side of the mirror, by using some gaffer tape as a guide, the width of this bright cresent appears to be  the same as the area not picking up polish, . So, back to fine grinding ( if so which grit size) to get rid of this, or mask the outer 4 mm and figure  ?
Regards
Darryl Wilson