The hole is right in front of the gudgeon plate. The closest part of the circle to the g plate is where it won't cut through. The jig saw is what it is. I've researched different blades and I'm pretty sure they don't come longer. I'm about to use the circle I cut as guide and hopefully get a hack saw to cut through this. Do you have any suggestions please? When you say take the yellow foam out from the bottom not the top is that right side up or down? No idea of rudder bracket and now I need to fix wood? Don't understand how to see if mast hole is leaking, pretty certain neither of these holes gives a view of that area? I thought this stage was easy, why do I have so many problems? Perhaps try to be kind and don't answer that.