Model Expo Fair-A-Frame, For Perfect Bulkhead Alignment on SALE -Model Shipways Fair-A-Frame guarantees a straight keel with perfectly aligned bulkheads every time! Accommodates virtually any size keel, makes it plank-on-bulkhead hull assembly fast & accurate. Fair-A-Frames two parallel guides holds the keel while you work. Adjustable alignment unit straddles the base, ensuring that all bulkheads are square to the keel. A set of ten metal screws makes the unit fully adjustable in height as well as width.