It involved drilling a hole in the receiver and fitting a short length of hose that ended with a tap that could be accessed from the front hatch. At the end of the day just drain out the few cups of water that fill up the receiver. Much easier than tipping the hull on its side!
Must have been Dave, Stringy. Sounds like a good idea if you are trailering the boat, but if you are car-topping and have to remove the akas anyway, it's no problem at all to roll the hull over. I do it anyway, since I carry the boat inverted and don't want salt water dripping on the car (from any part of the hull).
If the mast well is filling while the boat is being stored outdoors, two obvious solutions are to either store the hull inverted or use a tarpaulin, which will also protect the boat from the sun and keep out dirt and leaves.