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Old 17-06-2018, 10:04 PM
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Wavytone is offline
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,151
Hmm... sorry pardon my skepticism, but someone on CN recently proposed making a large gregorian with rather fast mirrors similar to your numbers using sandpaper and a lot of elbow grease, and hoping to literally "eyeball" the figure to the desired shape with no more than a steel rule as measuring equipment...

Not you, by any chance ?
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