How do we keep the pool cover ON the pool at night? Dh and I tighten as much as possible..but every morning the pool cover is OFF and floating in the pool. Isn't that so not the purpose? lol Are there any clamps we can use for it to clamp it to the metal frame to hold it? If so..what kind do I look for? I looked at Lowes and Harbor Freight today..but left with nothing as I didn't know what the heck to buy. Also...does anyone make some type of hooks that can be hung off the frame to hold the cover up off the ground? All I found were small type hooks.