How many back assembly types are there for the slimline dishes? I got a dish off the web and the back assembly is different than the 2 listed in all the literature I have seen. I think it works similar to the type 2, but I wanted to make sure before I break it (picture attached) I think it has 1 azimuth lockdown bolt on the top/front. I believe I only have to loosen that bolt to adjust the azimuth. the elevation has 2 lock down bolts, 1 on each side, and the nut holding the fine adjustment. to dither elevation, I only need to loosen the 2 lock down bolts. does that sound right?