This cam bracket is a perfect way to make tacking easier on the J22. Traditional setups for the J22 have two cam cleats for the traveler - one on each of the horizontal and vertical portions of the cockpit seats. This bracket moves the cam cleat mounted on the horizontal portion to a higher position off the deck, making it much easier to lock down on the leeward side before tacking.
You'll only need to drill one additional hole, as two of the three attachment points use the same holes for the upper cam cleat. The bracket does not come with the integral turning block, but the Harken Bullet Single Thru-Deck (H088) is a perfect fit -- bend the tabs on the block to fit flush with the bracket.
Cams and turning block sold separately, although existing cam cleats can easily be reused.