Originally Posted by chucklesR
Having talked in the chat room I feel compelled to make a fuller answer.
Drop the main halyard (which presupposes it's run aft) to a set, marked point, then pull the reef line down tight. It'll hold.
Lazyjacks (a must) and a couple reef straps and you are done.
FWIW, on most boats you also need to ease the boomvang.