Working on my '81, I needed to cut out / off the centerboard that the PO had kindly glassed to the hull. As my cut line was sorta wobbly, I sliced into the hull outside of the centerboard well. Probably just as well for the twenty or so gallons of water that drained out. I had pumped out the interior from the low spot (where your pump is mounted), and thought the interior dry. Anyone run across this before? BTW, this boat has been on the trailer for at least five years and the hatch hadn't been secured correctly, hence the water inside. Since I've had it and properly closed the hatch, I've seen only a trickle from the fwd hatch and the floor's been dry. My guess is somehow the water has gotten between the liner and the hull?