Agreed or just state the wires exit at the rear and route downwards in the slot used for the bottom fixing screw of the bracket.
I too had this problem and no matter what I loosened and tightened I always ended up with a 1mm gap on one diagonal. I checked the extrusions for squareness and the frames for flatness but couldn’t make sense.
In the frustration of many assemblies and dissassemblies, I eventually found by reversing the front plate the problem dissappeared. The plate looked perfectly flat but it wouldn’t take much more than the slightest twist to cause the problem.
Hope thsi helps
I too have had this problem. As soon as the final screws were tightened the frame would then wobble with a 1mm gap.
After much swapping around and many, many tries, I found that reversing the front plate cured the problem. Almost suggesting that either this or the the rear plate were not completely flat but, without a surface plate, I cannot confirm that.
Anyway maybe his will help someone else. Wasted 4 hours on this step.