(Here is a nice how-to article on building a radial jib fitting from the Miami Valley MYC Newsletter, Editor.)
This is the radial jib fitting used by Manny Costa on three of his National Champion Stars and EC 12. It could probably be lightened considerably for use on a One Meter.
To set-up the boat. With sails bent on, (1) swing to full out position and use vang to bring boom perpendicular to mast, and (2) adjust pivot adjuster screw to bring boom parallel to deck. See drawing for more details.