This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
A: [From an old WolfSport catalog:] Place a 15 mm socket between the arm and
foot of the lower hinge (to the outside of the hinge anchor bolt). You'll
have to almost close the door to get & keep it in place. Now gently! exert
some force on the door & the check alignment.
[From Jim Macklow] I've had success with my wife's Rabbit by doing the
following: Open door, then jack up door with floor jack, making sure the
door is closed as far as possible.
 
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