sentences:  Several Seattle owners, who owned boats with Ballenger or Sparcraft single-spreader masts, pioneered a technique to move the single-spreader rig's existing capshroud terminals to the very top of the mast by elongating the spreaders and cutting longer capshrouds.Due to some challenges of steering the boat downwind in a blow, some boats were fitted with elliptical rudders to improve handling.These rudders were typically fabricated by Moore.