Keel Pin
I think you'll want to drop the whole keel. It can be done on a trailer by jacking the boat and blocking it about 8 inches above the bunks. Be sure the trailer and boat are as level as possible before beginning this task. Lower the keel with its winch so that it rests again on the trailer pad. Then with a good jack (most use a hydraulic 4-wheel auto jack) put a little pressure on bottom of keel near its pivot point. Then loosen the 4 bolts, and lower. Catalina Direct sells a nice replacement pin and its assembly and bolts for replacement. While the keel is down you may ant to paint up in the tunnel with bottom paint. With new parts in place, carefully raise the keel with the jack, and screw the bolts back in to place (they must not be too tight as you can break them off so they say). Directions are in the C-22 tech. manual. About a half day job. Good Luck, Dick