I apologize for bump an old topic from the dead, just have a few interesting observations from personal experience, maybe someone will need this information in the future.Well as a long time (17 years) above ground pool owner, I've tried all the tricks and gimmicks and found my own personal solution(s). First, I use two large semi truck tire inner tubes stacked and duct taped together to keep them that way and use four 1/4 inch nylon ropes, evenly spaced to tie them off in the center of the pool. Second, I remove the directional ball cap of the incoming line from the pool pump and plug the line with a rubber expansion plug. Third, I've buyed a plexiglass pool cover https://thehomedweller.com/best-pool-covers/
with gasket that I place over the skimmer opening using the screws that hold the skimmer in place to secure it. Fourth, I fill the pool to within 4 inches of the top of the pool, then pull the cover over it. I no longer use the cable to secure the cover, I use one gallon milk jugs filled with water and hang a jug on each grommet. Most covers will have two grommets side by side for the cable to run through and I attach a jug filled with water on each grommet. The process of hanging jugs takes two people working opposite of each other to keep the cover from sliding off. Once all the jugs are hung, the cover stays taut, no water or debris gathers on top of the pool and spring opening is a snap! I disconnect the pool filter completely, drain it and put it in the garage for the winter.