Changing From Beaded Liner To Overlap

I need to replace my liner. Looking around, overlap liners are more readily available and considerably cheaper than beaded. I did some research. I think that if I were to buy an overlap, then I would need to take the rail seats and top rails off, and then install the liner directly over the wall, then put those parts back. Is that correct? Of course this will make the pool wall much more flimsy than it is now with those parts in place, so I'd have to have a way to support the wall...

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