(Sorry about the high pitched noise at the beginning of the video. I’m using a cheap loaner smart phone while waiting for my new phone to come in and for some reason it makes that noise when I start recording video.)
I am trying to get HIC Technology to replace this defective part and they are telling me that I assembled it incorrectly. I took this video and pictures as proof that I did not assemble it incorrectly and the part itself is defective. This 3D printer was purchased from Amazon: https://www.amazon.com/gp/product/B00N7I1ZVU/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
The part itself is not square which prevents the X-axis assembly from moving up and down on the Z-axis motors and threaded rods. The ONLY way that I could get it to move smoothly up and down was to loosen the screws holding the threaded brass bushing so that it could sit square with the rest of the assembly as shown here: https://s83.photobucket.com/user/jefrom19/media/3D%20Printer/2015-02-16%2018.45.06_zpspidjult4.jpg.html.
After loosening the screws holding the brass bushing in place, I could then move the X-axis assembly all of the way down on the Z-axis, as shown in this picture: https://i83.photobucket.com/albums/j314/jefrom19/3D%20Printer/2015-02-17%2015.18.00_zpsj9zwzhzo.jpg
The rest of the album is public if you need more photos: https://s83.photobucket.com/user/jefrom19/library/3D%20Printer?sort=3&page=1
***UPDATE 5/3/15***
I have made several upgrades to my printer since this video was taken. To see what changes I made, look through this forum thread: https://www.502streetscene.net/forum/showthread.php?p=4053746#post4053746