i checked out those servo mounting screws from micro fastener, it does not appear that they have a bushing or collar to take up the extra slop in the servo ear. is the threaded portion of the screw the same diameter as the hole in the servo? if not seems to me that you could have the potential for servo movement. the grommet, bushing method may allow slight, and i do mean slight movement but, will most likely return the servo to its original position. if your servo moves due to smaller screw diameter, you better find your flight trims quickly.