21' x 41' Oval Stone Mosaic Uni-Bead liners require no bead receive (liner track) for proper installation. They fit in the pool only one way, so there's no more wrestling with the liner and adjusting it as it fills with water.
In general terms, place liner in pool, attach it to the top of the wall, make certain the bottom liner seam is equidistant from the pool wall around the entire pool, then start filling with water. There may be a few wrinkles you'll need to feather out by hand as it fills with water.
