Finally got round to lifting all the floorboards to check the "bilges". About half a sponge worth of water to remove, which is good. I always get some rain in through the companionway and it sloshes about under the floorboards. Some years it gets to the level of swirling up onto the carpeting when I'm heeled, but I think I have largely stopped most water getting in by enlarging the drain holes in the washboard channels. I have also kept the spray hood up when I remember on the mooring. That is when most rain gets in. When I put the floor back down I will use fewer and shorter screws. I have no idea why I used so many in the first place.