I have a wood block I put under the jack and crank and not all the way, just so the bow is up. There is always going to be some rain water getting in there but there is no need to worry!
There was a post from someone a long way back that use to put a small rag in the drain hole and leave it hanging out so it would wick away the water and he said the bildge would be bone dry!
But its all a waste of time IMO
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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