Aw, Sh ... oot

How is it, how IS it, that you can handle a block multiple times, but never see the error until it's surrounded by 6 seams that need to be picked out and resewn?

Two halves overlapping gives the illusion that the right-most column is incorrectly offset by 1/2 of a square.

Taking a break from ironing the long seams, admiring how the halves of the top are looking, and that blasted red square might as well have had a laser burning a hole in my eyes. Now. Not a week before, when it would have been simple to fix.

I ended up picking out the paired squares (the red and the white below it), flipping the unit, and resewing everything. I got 6 more quads of HTS, toward the building of the current Leader-Ender Challenge, out of this little detour.