In article
,
DerbyDad03 wrote:

"And you still have given me no explanation of how the thread of
the screw inside the wrench is determined. There IS only one way. By
dis-assembly."

You've got more patience than I do with our idiot English friend. I
don't think Harry's ever actually seen a crescent wrench. If he doesn't
have his own, he could take a look at the video around the 9-12 second
mark and they show a closeup of the wrench. Not much hidden about the
thread mechanism. It isn't "inside" the wrench at all.