simple fix to a widespread problem
The centerboard on my '79 23 stuck in the keel too (on my maiden voyage with her no less, with 20 knot winds, etc.). I had the boat hauled and the centerboard freed. However, it stuck back up there again the very next time I retracted it.Someone on this website suggested I try freeing it with a four foot steel rod through the pennant line hole. I bought a 1/4 inch diameter, four foot long rod at the hardware store for about $2. I removed the plastic grommet around the pennant line hole, put the rod inside until it was touching the centerboard, and gently but insistently pushed until the board was free. I now do not fully retract the centerboard. I suspect that the board has swelled over the years, and the only way to "fix" the problem is to replace the centerboard with a new one. I like working on my boat, but not that much. Good luck.