As the blade is lowered the rear undergoes a .005 inch shift to the
right. So, if perfectly aligned at almost max blade height the blade
will go .005 out of parallel as it is lowered to about 1 inch. I've
repeated this a hundred times and have been sure not to fully raise it
to the stops when taking the high measurement. Also did the quick test
on the tie bars using flat glass pane and they are not perfect.