Just installed the rear handles. The rearmost mounting screws are not long enough. However there were 4 longer screws in the box with no directions. I used two of the 12mm ones in the forward hoes and moved the two 10mm ones to the rear holes. It worked well. There is no indication what to do with the extra long cables once they are connected. I did not attempt to push them back into the handles, I tucked them up over the rear leg ar.
The directions say use the 4 mm Allen wrench to remove the cover to attach the display mounting bracket. They are 2.5 mm screws.

You might want to update your written instructions or produce a video. Better yet, do both.

I ORDERED THE 16X NOT THE 19 AND IT CHANGED SOME HOW.

Ordered Q-zone Hoop frame, Q-zone hoop track upgrade (not easy to assemble but we managed and it worked) and plastic Pattern Perfect kit. We then decided that the throat of our domestic machine wasn't enough to suit our needs so we ordered the 16x Elite which came with front handles and display and we completed the upgrade (also not an easy task). Well & good and it works. We'll eat the cost of that misjudgement. However, now it turns out, the hoop track upgrade from the original order is useless without spending an additional ~ $500.00 or so for a set of rear handles and display for the 16x Elite. We have found the options to be as difficult to navigate as the hardware is to assemble, too confusing and costly when ordering direct.