Hello again: I'm still restoring a 62 year old concrete pool... Once finished it will have a vinyl liner. I am installing an new skimmer, and am wondering how much space I should have from the top of the skimmer face plate to the liner track. I have some flexibility on the skimmer location (now), but once it's mortared in, it's mortared in. I imagine more space between the top of the skimmer and the liner track is preferable, but I want the water level as high as possible on the pool wall. Suggestions?