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If your 21' is like my 17'.....
Then it reefs by rolling the main around the boom. There might be a pin on the front of the boom that you can pull, which will allow it to slide back and rotate (not the pin that keeps it attached to the mast!) Then, somehow, you ease the main halyard whilst rotating the boom, all the while keeping the boom up out of the cockpit (hopefully you have a topping lift.)
I haven't had to do it yet, we were out last week in around 15-20, had to head up in a couple of puffs, but no worse than that. I did add a topping lift recently, I figure that next time we go out I'll experiment with the furling/reefing system.