Helping a friend align his 10' button hook. We're at 35.5 Latitude, -94.3 Longitude. pole is plum, dish elevation angle 36, Decl is 41-42. alinged to 174 true south, Sat 95W 4167 V, 6614. Lnbf is a good one, but no quality..I notice the lower end of the mount has alot of play probably from being left loose and worn enough that it rocks back and forth.When its'd tightened down, it eliminates that. How do we check to see if the lnb is in the center of the dish? I measure from all four edges of the dish to the scallar ring and they are equal. Checked the focal depth and focal length. What have we missed? Thanks.Ed