Hello, I need a little help. I have gotten a 24" Comm Dish setup for a single lnb. (like the dish 300). I have a Dish 500 setup with the twin gun. I would like to put the twin lnb on the 24" dish mount. What do I need to do? Do I just need to screw it on? or do I need cut the length of the arm. Someone has done this before me. Any help would be great. Thanks...