M_Boats: removing the pivot pin for the center board

All, I would appreciate any tips on pounding out the center board pivot pin. I got the stop pin out but could not budge the pivot pin on my M-23 centerboard. I mushroomed the ends of my 3/8" steel rod trying. The board did come down all the way with some coaxing (good!) but the pin will not move. Thinking maybe stainless steel long bolt or center punch for the next episode but I would like suggestions. Thanks Robbin