Hunter has a Tiller Lock for the 23.5, and other (240/260) models. (Tiller Lock, under Cockpit Products) Cost is pretty prohibitive, but it works and it's a nice-looking, heavy SS item to clunk around inside your cabin when underway. I went looking for a cheaper expedient and found the following solution:1. Rigid 1-1/2" PVC conduit (had to buy a 10 or 12 ft. piece, but it was about $3.80). One end is larger (in order to join conduit sections together). I used this thick side for the bottom and cut it at an appropriate height. This larger diameter side of the PVC conduit goes into the square plastic receptacle on the cockpit sole made to hold the table leg.2. You must remove this plastic receptacle (couple of flathead Phillips screws) and then very slightly round it out, so that the wide diameter PVC conduit tube fits inside snugly. Then replace the plastic receptacle. (The table leg will still fit OK.) I just used a round wood rasp, then filed it to make it smooth.3. For the top, I bought a PVC plumbing joint 4" ($0.68) straight section that just fits over the small diameter of the PVC conduit. I shaped a hole laterally at the top of this joint piece, using a 2" (or 1-3/4", or some such?) hole drill...then just glued it on the top of the PVC.Simple 1-2 hour craft project (includes trip to Home Depot, and to the boat to measure) with costs under $5 or so. Not real pretty, but it's functional.