Abstract: In accordance with the first embodiment of the invention, a first and second tube body is provided, the first tube body resting upon the upper surface of the cover, the second tube body beneath the cover. The first and second tube bodies are plugged together at the ends to form a tubular spindle-core apparatus which is extended to traverse a buoyant flexible pool cover utilizing the buoyancy of the cover to be free-floating with the cover upon the surface of the water and within the perimeter of the pool. In the second embodiment, a single tube body which is octagonal is provided as a spindle-core to be secured upon a buoyant flexible pool cover utilizing clips of similar geometric shape where the octagonal spindle-core shape provides a seating for clipping the buoyant flexible cover to the spindle-core.