What O'Day said about the matter...
In the original O'Day owner's manual, they do have advice on the subject:"The O'Day 22 has 600 lbs. of lead ballast glassed into the keel, which is more than adequate; however, you can add more, if you prefer more stability. The easiest way to add is to pour lead shot (available at any good sporting goods store) into the keel area through the bilge drain plug. You may evne mix with catalyzed resin for a more permanent job, but be sure area is dry. We have customers who have added 200 lbs. in this manner, but be sure to increase positive floatation at the same time in order to support extra weitht, should the hull take on water through a leak or hull puncture."I do have an early O22, a 1973, which I assume has the original 600 lb. keel. They added 100 lbs. on later boats... but I have to say that I never found it necessary to have more. I have to ask... have you sailed your boat yet? If not, sail it first, then decide. I concur with the other guys, that you should reef to fit the wind, and keep your boat peppy and lightweight as designed. I've sailed in some rough stuff, and reefed down the the mainsail to handle it. I was able to sail with a beam sea, in 20MPH winds at least, at hull speed... and not feel like I was even going to bury the deck.Another point to make would be that ballast added, as they suggest, would only be just below the waterline... and not have the same righting moment as the same 200 lbs lower down the keel anyway... you'd be adding all that weight, and not getting the all the advantage.Personally, if I ever wanted to do it (and like I said, I am not interested in doing it), I would cast two lead bars of 100 lbs each, and bolt them to the sides of the bottom of the keel. I would cast nice teardrops, then set them in epoxy, and run four or six 1/2" stainless bolts right through the keel. Now that would get your 200lb worth, if you wanted it. But I'm not recommending anyone do it... just musing "out loud". Rich.