The two bolts connecting the board to the base are rusted and need to be replaced. I was able to remove the board from the base but I can't remove the bolts from the board because they are severely rusted and stuck to the board. It appears that the rusting/erosion of the bolts has adhered them to the board. I'm leery of trying too hard to remove the bolts because I don't want to damage the board. Is there any way to remove the bolts without damaging the board beyond future use?