Ken, I had this same problem on my Westy, turned out to be more than I
expected. Kind of hard to explain but here goes.....
In  the "elbow" of the lifting hinge mechanism for the top I found it pivots
inside on a section of tube, this had worn thru on the left hand side and
caused my top to lean to one side when up.
Easy to check, look closely at the point that the upper arm (the one
attached to the top) pivots in  the "elbow". When you lift the top it should
pivot uniformly in the "middle", compare to the other side.
Might be an idea to check this first.
Hope this helps.

----- Original Message -----
From: "Ken Hunter" <EVEHART33@AOL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, November 15, 2000 03:00
Subject: Need advice adjusting pop-top

> The pop-top on our 82 Westy opens and closes fine but doesn't seem
centered
> when open. When folding out the top bunk platform the fabric on the driver
> side has to be pushed out or the platform will tear into it. I have looked
at
> other Westys and the bunks fold out with equal clearance on both sides. I
> don't quite know where to begin tweaking it so any advice would be
> appreciated.
> TIA
>
> Ken Hunter
> 82 Westy 1.9D
> 84 Jetta 1.5D
>