Sorry to be late to comment! Believe it or not, I have been following along and last night at about 4 AM in bed, my brain started whirling, and I started questioning a few things. Most had been addressed long ago (there may be one trig error but it does not effect that BIG vertical offset), but not this item. It may be nothing at all, so I'll apologize in advance if it wastes your time, but stuff DOES move around when bolts are torqued in place.