I have a spinner for a mick reeves spitfire,unlike my spinner for my stuka,it has nowhere to run self tapping screws to mount the spinner to the backplate,the only thing i see is a large screw running threw the top of the spinner,do you use this to mount it to the backplate?im baffled,i hope im just being stupid,but what would hold the spinner to the backplate if there is no meat(metal)to run some screws in.