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@nothas
but 107mm-103mm=4mm it's 2mm on each side isn't it? so 3.17983012 degrees
1.5mm -> 2.38594403 degrees
please correct me if I'm wrong
EDIT: yeah I'm wrong
arctan(3 / 360) = 0.477453777 degrees
arctan(2 / 360) = 0.318306611 degrees
arctan(1.5 / 360) = 0.238731033 degrees