attaching main to slotted mast | Larry Ludwig via yahoogroups.com

You use a bolt rope main just as you would on a full sized boat. You are correct that you use something as a bolt rope in the luff (hem) of the mainsail. We use "weedeater" line. It is stiff but flexible and slides in the sail in seconds and you are ready to go. It not only makes changing sails a breeze (pardon the pun) but gives you THE best aerodynamic flow from across the mast onto the sail. The earlier that the airflows smoothly aft of the mast, the more effective sail area you have, that is what makes the airfoil shape an advantage.