A new and improved apparatus is disclosed for rolling up and laying out a solar pool cover over a pool. The system includes a first attachment structure configured to be attached to a first member of the joint and a second attachment structure configured to be attached to a second member of the joint. A larger, upstream socket formed in the body of the heat nozzle fits onto the heating barrel of the handheld, portable welding gun. Also, since interference between a horn for applying ultrasonic waves during ultrasonic welding and the external connection part is avoided, the camera module can be made smaller. Otherwise, the antenna is repositioned and the process is repeated. The counter-surveillance detection system and method is configured to detect foreign objects within a defined field of view using an analytic software method operating on imagery data from the camera that is synchronized with the illuminator source.