Here are the pics of the mounting, but I'm sure yo already figured it out from the description. It was a quick and easy solution that has served me well. I forgot to mention that I put large rubber bumpers (rubber stool leg feet) on the bottom two mounting holes (as you can see in the pic) to keep the whole unit perfectly upright and to not marr the rim.
Just found out that I can't put a picture here that isn't online. I'll just put one on the board under technical discussions. I'll let you know what the title is so you can find it easily. - Dave