Abstract: Improved spreader assemblies for cable trussed masts of sportfishing boat outriggers have spreader arms formed of straight metal tubing and a cable guide through which one of the cables passes is removably fitted into the outboard end of each spreader arm. There is a spreader arm holder that includes a collar sized to encircle the mast and four bores in such collar are positioned in a common transverse plane spaced 90.degree. apart in which the inboard ends of the spreader arms are retained. A lug extends laterally from the collar at each collar bore location creating an extension of the respective bore to provide support to the inboard end of the spreader arm inserted in such bore.