As you can see I made a modification to the retaining post by cutting off part of the bottom mount so I could mount the shade post to post. This give everything a cleaner look and a sturdier mount. Bought 4 of these to block wind and rain. They are really nice because they tuck away and allow an open patio when not in use. Quality feels good from casing, to shade material, and handle. Two Allen head screws mount these to the post which will make winter storage really easy. Very happy how this turned out.