Follow up: I have completed the install and it is working great. For others that may do this conversion from the single LNB to the winegard G2, I removed the crank-up dish from the roof, and left the leveling ring in place. Installed the G2 on the leveling ring after removing the 4 rubber feet, and put 4 screws down through the ring into the roof, in the front, and 1 screw on each side on the rear side of the dish, sealing all screws and around the leveling ring, and sealing the plate I installed over the 1-1/4" hole on the roof. There did not seem to be a splice in the celling I could find, and the coax on the roof was in really good condition considering it has been on the roof in the elements for over 12 years.