Hi, I just found this forum. My wife and I just installed a new wall on our 15X30 AG pool. We also went with a J-hook liner vs. the overlap liner that was originally installed. The liner doesn't seem to fit, but it is the right size. We were able to hang it only on about 9/10th of the wall. Does temperature and sun play a big role in installation? We tried stretching it some, but the outside temperature was only in the 40's with no sun. Today should be middle 50's with plently of sun. I was under the impression that a J- hook liner didn't need to be stretched that much. Are there any tips to installing a J-hook liner? Any info would be appreciated, thanks!