Too obvious...146 drain plug?
Ummm...how about the all too obvious...is the drain plug in?
I was pumping water out of my bilge, from that 4" access hole in the stern, until I realized that the plug had worked it's way out - you know, the one just under the rub rail at the aftmost point of the boat.
You can replace it with a Seadog - 520010 (that's the whoel assembly - I forget the part number for just the plug, but it will tell you it fits the 520010.
You could probably just use a cork or a bottle sealer until you figure it out.
I hope it's something that simple, and embarassing, so that I can have company in MY embarassment this summer!
If not, I don't have any good ideas. Are there any cracks at the centerboard surround? Try calling Hunter if none of our experts here can chime in...
(P.S. lucky you to have a lift!! Mine sits in mucky water at its slip!)