Abstract: An invented track construct component system with a threaded radial bearing end pulley is described for pool cover systems that includes an extruded longitudinal cover track having a top longitudinal anchoring slot, a C-channel longitudinal slot along one side edge for capturing and holding a side edge of a pool cover and associated sliders carrying a leading (front) edge structures, a cable return channel with a longitudinal slot opening along the other side edge for receiving and protecting cabling connecting between sliders/front cover corners and associated cable reels. Each cover track is secured within separate extruded side wall channel structures having a top channel side wall with a depending longitudinal shaped for snuggly fitting into the longitudinal anchoring slot of the cover track. The extruded side wall channel structures are incorporated into the side wall of the pool.