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I use wooden plugs to fill the oversize thru hole, the tubing won't give you any bouyancy.
The whole thing is about the difference between the center of bouyancy and the center of gravity?, at least I remember the terms as that. Read a little bit about yatch design and you will find some good explanations. Weight in the ends makes the boat/plug respond slower, weight in the middle makes it quicker. It's not just how much weight it's where you put it. Don Musso is a master of this, look at a superstrikes weight placement.
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