Yes, I used the davit on the CD 22. We both have back problems and this davit helped us to avoid heavy lifting.
The davit is a SS tube in two pieces (I suspect that it could be made with three sections. The SS tube is about 2" in diameter. There is a Derilon ball which has a plastic and SS base. This can either be screwed/4200/5200 into the floor of the cockipt. The upper support is an anodized aluminm peice which the 2" SS tube fits into. This is made to mount on a railing--the davit was designed for sailboats, thus the idea of using it on a railing. We have used the half of this piece which clamps around a rail bolted thru a fiberglass combing. Right now we have it mounted on the port side, inboard, so we can pick up the generator, and fuel tank and place them on the swim step. We can also pick up the dinghy as we roll it up and bring it aboard. We will be putting a second mount on the stb side by the entrance, to bring coolers and other heavy objects from the side aboard--this will also help to handle the dinghy motor.
We are going to have a bracket fabricated out of SS to support the ball which the bottom rests on, and will stand out from the cabin aft bulkhead enough that the davit will be straight, when the upper support is thru bolted thru the lip of the cabin top.
We feel that the bottom can be screwed with #12 or #14 screws, and no reinforcment is necessary on the C Dory hull bottom or deck. The sealant must be good I tend to put the screw in, pull it out, then coat the inside with epoxy, and after it has dried, put the screw back in with the sealant.
The reason I like this davit is that the SS work is excellent, it is much more sturdy than competative davits. Most impressive is the construction of the pulleys for the line and the design of the jam cleat.
I will be happy to take specific photos if anyone wishes. The davit stows in the side pocket of the TC 255. I have it on the stb side, along with a collapsable boat hook. The port side has a boat hook, brush, gaff combo also in clamps.
Hope that helps.