Hey Paul, i too buy the metric screws for the props at Ace Hdwe. and drill out old cox nose cones to fit to the prop. And by the way, i started on that spitfire today from the plans you sent me last summer. Wing is finished, spent the afternoon running the engine for it i thought! OK cub .099, just like my other cubs, as soon as you put on a prop small enough to get good rpm's they seem to vibrate to cause fuel foaming! Anyway will try a norvel .074 this week and then start on the fuselage. Will post when complete,, later Ray