The stock plastic shaft cup on the FT009/016 is NOT a standard cup. It is plastic and can break if you upgrade to a larger prop or a faster motor.

You cannot buy this shaft cup as a replacement part alone. Therefore, you either need to 3d print on your own ( ), or get a metal one instead.

Most standard metal cups would not accommodate the relatively large shaft pin of the FT009/016 so you must do some filing manually.

Metal shaft cup like the one shown above typically offers two hex screw holes. You should use both!