know what you mean by glamorous assistant!
BTW if your rotate around the top mount you tend to open up the gap at the front of the door, if you rotate around the bottom mount you tend to close up the gap at the front of the door. Looking at the geometry I did not think it would make much difference but in practice I found this a useful way of adjusting both the height of the door and both the for / aft movement of the door. Useful if you are being anal about getting your shut lines good (better!). Which your rotate around depends on how much you undo the bolts holding the top and bottom hinge points. The one you are rotating around you undo less. So if I wanted to open up the gap on the leading edge then I would undo the top bolt by 1/2 turn and the bottom bolt by 1 turn (having first taken the weight with my jack) then jack the door up a little and retighten. BTW the absolute number of turns to undo the bolts by are by memory from my car, yours might be different.
Let me know if this is not clear.
cheers
C43