I have an older 21ft round Esther Williams pool that we inherited around 3 years ago. There are 2 cover pieces for the top rail at the corners of the deck which I have not been able to figure out how to put in place. Below are a couple of pictures of the right corner. I have the inside (water side) pieces which are not the issue it is these 2 odd shaped pieces I have not been able to figure out. They don't seem to fit well in these corners. Any pointers from Esther Williams pool owners would be greatly appreciated.