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You are right again! I'm sorry it was very late when i uploaded the file and missed those items, now i reuploaded the black parts, including both propeller and wheels for the landing gear.

There are 2 wheels one goes clockwise and the other counter-clockwise while screwing (because they are mirrored)

I am happy to see you already started printing, it looks very nice, enjoy the model with the full set of items now!