The hitch that attaches to my truck has an adjustment bolt at the bottom and a gold colored nut with teeth at the top. These control the angle of the piece that holds the ball for the trailer. Can anyone tell me if the gold colored nut should be tight or left a little loose so that the piece the ball is attached to can move up and down. I'll try to post a pick with this post, but I don't see to be having any luck attaching it. I see where I can attach a video, but not a jpg. Anyway, if it doesn't post, maybe someone will understand what I'm asking without the pic... Thank you!