Norm, Hope This Helps
Gleaned from the archives, written by Phill Morris, of Kingston to another owner about removing the CB:"The centerboard on my 1977 O'Day 25 has a hole through it near the topleading edgewhich a nylon rod is fitted to act as a pivot. The ends of rodslide up into vertical slots in either side of the trunk and are preventedfrom dropping by fiberglass wedges which slide into the slots and areheld in place by stainless steel plates screwed into the lower surface ofthe trunk. Wear on the nylon rod is minimal.Only way to examine is at haulout. With the boat on a hoist and supportedon stands the plates can be removed and the wedges and centerboard removed.I doubt that it would drop out unless the (machine) screws loosened. I useLoctite on the threads just in case.Keep the cb up on downwind sailing --it just acts drag.My centerboard also stuck if it was fully retracted. I marked the pendantwith magic marker so I don't pull the board up too far.I have almost cured the problem which in my case was too little clearancebetween the top trailing edge of the cb and the trunk made worse by watergetting into the cb.I removed the cb, dried it thouroughly over the winter ground off the seamswhere water was getting in and epoxied them. I then ground down the facesof the board only in the area where it was binding and faired the surfaceswith epoxy to provide about 1/8" per side extra clearance.The result is that the board doesnt stick unless I pull it up fully andthen just normal wave action will release it.Hope this helps."