The MW Locker is a new item custom made for the lower mast adjustment. The Locker clips onto the turnbuckle and slides onto the adjustment wheel to keep it from moving during sailing or trailering. The Locker will keep your mast rake in tune until you need to adjust for conditions. This simple device is made of plastic and weighs next to nothing, so it won’t affect minimum weight. Made in the USA and a Finn Parts USA exclusive.