Use my "Jiggle Valve" - get an old spoke and straighten the j-bend the best you can. Chop 1/2" off the head end. Get a drillbit that's slightly smaller than the head. Drill the hole in the lowest part of the BB shell. Drop the spoke though it (from the INSIDE of course!). Re-install the BB unit. Now any water drains out and the jiggling spoke will keep your hole unplugged