Thanks Waste.

I think I understand what you're saying: Wait until the water gets near the bottom faceplate of the stairs, then raise the vacuum lines up a bit, and if I've sealed the liner good enough - the liner should pull into the area where the stairs extend out from the wall (hopefully the liner will stretch enough to be flush against the wall at the bottom corners of the stairs). I suppose I could heat the liner with a hair dryer if I have to, and manually force the corners in?

Jeff