Camera lucida drawing aid.
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Previously:
https://www.homemadetools.net/forum/...279#post154165
https://www.homemadetools.net/forum/...805#post156136
https://www.homemadetools.net/forum/...532#post143000
https://www.homemadetools.net/forum/...112#post125899
https://www.homemadetools.net/forum/...443#post127497
