Last year I installed a Spinlock PowerVang on Joust. It is very expensive but might be the one of the best. It uses light gauge spectra internally for 8 or 10 to 1, then I rigged a simple 2/1 outside to double the purchase. It's well built, attractive, clean install and wonderful because you can select a variety of boom heights and lock it at any level. Useful for everything from lashing to the cabin top winches for pre-hurricane tie down, to holding the boom up in our Chesapeake Bay drifting distance races to keep some shape in the main to maintain some forward motion! Highly recommended.
