Motor housing screws appear to be size M1.6 x 16mm. Can these screws be replaced with commerically avaialble screws having socket head, torx head, or other head styles. M1.6 falls outside of the rule R7(c) by one screw size.
R7 (c). Any commercially available #4, #6, #8, M2, M2.5, M3 or M4 screw up to 2" long (nominal), and any commercially available nut and/or washer to fit these screws. The intent of the rule is to allow teams to purchase their own commodity hardware without introducing additional functionality not found in standard VEX equipment. It is up to inspectors to determine whether the non-VEX hardware has introduced additional functionality or not.