I found the same thing with regards to the curve with the boxes flipped. That was my reason for not switching them. I may try switching them again when I do the final assembly.Thanks Jim; I remember considering that when I was assembling it, but decided not to for some reason. Memory's a bit foggy, but it may have had to do with the curves required in the tubing when the boxes are flipped around to the top. I think I was worried that if there were too many curves, the additional internal friction would make the rather crappy wiper motion even worse than it already.