The wire is a topping lift. My M15 has a similar 1/16" stainless wire topping lift. You should run a line from the end of the boom, up through the block and back down to the boom where there should be a cheek block and/or cleat for adjusting the line. The topping lift holds the boom up while you are raising, lowering or reefing the mainsail. Be sure to ease the topping lift tension after the mainsail is raised, otherwise you will distort the sail shape.
Joe Kidd M15 #207 "Poco A Poco" _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
