Well I remember a similar trick but not sure it's exactly the same. Attach a rope below the boom's head, slightly longer than the mast diameter. When the sail is rigged on the mast, set the boom to max extension and slip it around the mast/sail tll the head is in place and the boom at ~45° up. Then make a loop around the mast, tie the rope to the head, move the clew down till the boom is at 90°, adjust extension and outhaul. This gives a very strong knot that will not slip along the mast.
Last edited by Farlo; 24th August 2012 at 06:44 PM.