Yes, working to US letter size in my book blocks makes for fewer headaches over the guillotine cutter, whose scale is only graduated in 1/16 inches (0.0625", ~1

Yes, working to US letter size in my book blocks makes for fewer headaches over the guillotine cutter, whose scale is only graduated in 1/16 inches (0.0625", ~1.5mm) and whole millimeters. Oh, the wasted 20 thou would get cleaned up in the face finishing cut, but all the same, half an inch is a much more convenient quantum here than half a millimeter.