Just bought a house with a pool. Trying to learn the ins and outs. This weir door seems off to me but also it does seem old and it is a little curved from years of use. Could it have shrunk as well? As you can see in the photo the catch that hangs down from the top is no longer catching/stopping the door. I measured the door and its 7 1/4 by 5 1/4. Im wondering if the correct size should be maybe 5 1/12 or even 6". Problem is I can't find sizes any taller that still fit the 7 1/4 parameter. So my question is do I just buy the exact same size replacement? Should there be that much gap between the top of the weir door and catch?