Reefing the Mainsail
If you had a tang at the end of your boom for your main sheet attachment, you could probably reef the sail by rolling it.   Otherwise, you would need to buy an attachment called a claw which would fit over the boom and rolled up sail.  I'd be very leery about using a rig like that, myself.  If your Mainsail is in great condition, your best bet would be to bring it to a sail maker and have him install reefing points.  Then you could rig it with Jiffy reefing.Joe