Not sure if this will help but it is what I did.
24 ft pool I had some 4" white light wall PVC pipe around, roughly 3 lengths which is about 30 ft. I glued those together with couplings and pvc cement. The "reel" sticks over the edge of the pool by about 2.5 ft on both ends. I found some white duct tape and applied it to the top of the liner to prevent the roller from damaging it. Last year I would just lay it on the ground, this spring I made up 3 small supports so it sits off the pool and against the fence out of the way.
To unroll simply grab an end and start turning, it is not too hard my wife can do it by herself. To roll off the cover I do not use anything to fasten it to the pipe, other then wetting the top of the cover and the pipe with pool water. After you get a turn and a half or so on it from the middle you can move to the ends and roll it off and store it. If you don't get it wet enough the cover will just spin on the pipe, plastic on plastic dry is pretty slippery.
*edit*
I also marked center on the pool and the roller and line those up at the start.