Here is the solution designed by Dave Sharp of Baltic Wharf Repairs in Totnes...a thinking man.
He discovered that he could build a drain through the floor of the buoyancy tank with no real loss of strength with this solution.
Clearly it will work best when the mizzen is unstepped simply because the drainage will be improved.oat
Warning: Be aware that "Pippin", with her updated transom, may not be configured the same as your Bayraider 20.