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Outstanding bit of design and very generous to share. I have a couple of questions that arose during the printing of some parts.

Rotor Assy. item 14 calls for M3 x 12 self "taping" screws to be used in a dia 4 hole (item 1) with a matching 4mm hole in item 6 Is this to use a thread insert or a larger self tapping screw? Also item 3 looks like it needs a countersunk version of item 14 which if a self tapping screw will not make a good bearing.
Also curious to see how to access the head of item 13 when setting the blade pitch angle.