Easy as Pie
Install two small cheek blocks below the second set of spreaders. The control lines go thru the blocks down to two small plastic cleats on the mast at boom height. I led my control lines through the two spare holes at the base of the lower spreaders (install nylon sleves for protection). The control lines terminate with a length of shock cord which loops through the plastic cleats. The cradle is formed by locating some ss eye straps under the boom. I used 4 but 3 could probably be made to work also. Work out the cradle dimensions by a little trial and error. In operation the entire assy is stored along side the boom, around the plastic cleats and up to the cheek blocks. Shock cord keeps everything tight but allows movement as boom moves. To drop the main, first pull each side up after releasing from under the cleats, secure the control line around the cleat, drop the main. After sail ties on, gather each side and return to the stowed position. If there is an easier way I have yet to see it. Aslo this works with you stock sail cover. The lazy jacks just get covered along with the mainsail.