Quote:
Originally Posted by Roger/Sacramento
It has been verified that a sheet of window glass standing vertically will eventually become thicker at the bottom than at the top. It sort of slides down as if like honey. I suppose this could happen to a vertically standing crank if left that way for a long period of time. So make sure when storing you alternate positions from time to time. Need data to know the proper timing on this theory. Has anybody on the BARN done the research ? 
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Roger, that was believed to be true for many years, until they found 600-yr-old glass that was thicker at the top. It turns out it was just a result of the process used to make it. If you can believe it, they used to blow glass in cylinders, cut it, and flatten it out.