OK, it must be that other capri 22 owners have a more active social life and are out dancing this Saturday nite and not trolling internet chat rooms but never mind, I'll tell you what I know. My 2001 capri mk II (888 sail number) has a pad eye on one side of the mast near the goose neck and a plain cleat on the other side of the mast. An eight foot line runs from the pad eye up to the reefing grommet on the main's luff, then back down to the cleat. So, when the wind pipes up, I let out the halyard to pre-marked amount then go forward to pull down on the luff's reefing line. Given the likelihood of needing a very taut luff (after all, the wind speed is high enough to warrant the reef), I have to "sweat" the luff's reefing line so as to get the luff as tite as possible. Then it's the leech's reefing line's turn; this line started in a similar way, i.e., from a pad eye at boom's end, up thru the leech's reefing grommet, then down thru a wheel, into the boom where there must be a second wheel forward as I'm tugging the line aft so as to pull the leech's reefing point down to the boom.
So, no reefing horn on the mast. I sailed a catalina 25 for a bit which did have such a reefing horn.
Wooster