I recently purchased a house with an in ground concrete pool (pool is filled with water). I noticed the drain cover was not affixed and upon closer view noticed that the drain screws are broken off, making the cover not stay on. Even though i'm in Southern California, where literally everyone has a pool, I can only imagine this could cost alot to have a pool professional come out an d fit it. Do I have to drain the pool to drill out the broken off screws or can I use some type of underwater epoxy to glue the drain cover on?