Anyone use one of these? I can get the "medium" unit for a decent price used. My mast/boom is already setup with a welded hinge fitting on the mast base and a tang on the boom. Incidentally the hole-hole measurement is EXACTLY the minimum setting distance for this unit. I just have to check that the jaws on the unit will fit these existing parts but it should be a bolt on. Anyone see a negative to this? I would assume that since the "soft" vang is attached to these points anyway they should be plenty strong? Thanks, RT