I'm sorry to say that I just spent an unimproving hour and a half
establishing that it is in practical terms impossible to remove the
bump on the lower pivot that prevents it opening more than 90
degrees.  Unless you're willing to make a hole in the outer door
skin.  I seriously believe that they must have installed the
quarter-windows before the outer skin went on the door.  With a
phillips-head screw.  Facing out.  With a piece of sheet metal 3/16"
outside it, which I think is the upper fold of the door skin.  And a
similar piece about the same distance inside, too.

The pivot is clamped by a strip of thick sheet metal with a slot in
the middle that is half the pivot circumference in length or
less.  This is folded from back to front around the pivot and clamped
together with a screw that also attaches the assembly to a tab on the
door.  The pivot has a bump on the shaft that runs in the
slot.  There's not enough access to get even a flex-shaft Dremel up
there to grind down the bump, and it prevents the pivot being removed
as well as being turned.  All right, I lied.  I *did* get a
flex-shaft Dremel up there, by making a slit in the lower moisture
barrier and passing the shaft up from there.  And if I'd been willing
to spend half an hour trying to make that nib dissapear maybe I could
have.  Five minutes sure didn't do it.  Ok, when I get my gumption
back I'll go in there and walk a worn-out cutoff wheel up and down it
(there's only about half an inch width of access there between the
two strips of sheet metal).  Maybe.  I really really really want to
open that window so it hurls air at me, 'cause I haven't got air conditioning.

It's easy enough to adjust the tension, because you can grasp the
sides of the screw head with nice sharp needlenose pliers and turn it
a sixteenth turn at a time or so.

I think this came from the same keep-em-guessing department that did
some of the cooling hoses...for total frustration with ten cents
worth of hardware, this has the hoses beat all hollow.

[/rant]

  --
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'89 Po' White Star "Scamp"