I ordered three faux-wood blinds. One worked perfectly. The other two blinds would not close tightly. You turned in one direction, and then it was like the ratchet mechanism would just run out of "gears" to run... there was a clicking noise. It ended up that I was able to got it working by sliding the hexagon tilt rod completely out of the string units and then rearranged the mechanism so that it had more ratchet room to use, to get the tilt completely shut.