The delaminated bulkhead. Not sure why I ever thought that squishing glue into the delaminated bit at the top was going to solve this. Every place where a hole had been put through the bulkhead, there was delamination. This is where the hiking straps went through,... This is the drain hole. It is like this on both sides of the boat and forward and aft on the bulk head. I tried just chipping these bits away so I could fill them but found the delamination extended a long way in every direction from the holes. So it was back to plan A - replace the bulkhead completely. I'm pretty sure this is a bad idea. When the boat was built, this was probably one of the first bits, with everything then attached to it. I was a little concerned that the boat might change shape when I took it out so screwed a couple of bits of wood across the boat just in case but it doesn't look like anything has moved. Getting it out should have been a problem. I was figuring that this was going to be my excuse...