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Without an explanation of what you are talking about, how do you expect anybody to comment or answer?
But to answer your specific question, only you know if someone told you the prop nut and cotton pin are on backwards. I do not know if it is true that someone told you the prop nut and cotton pin are on backwards, but I have no reason to think you are dishonest, so I suspect it is true that someone told you the prop nut and cotton pin are on backwards.