i recently got a 75 starcraft aluminum. along the keel guards( or at least i think thats what they are called- first boat, so im kinda learning.) there is a 1/4 hole drilled into each one about a third of the way back. I am assuming it would be for a drain of some sort? But since it does take on a fair amount of water and i dont know where it is coming from, i am wondering if i should plug those up? or are they needed?