Easy Peasy, well almost.  I just did mine last week.  Patience and perseverance or remove the cabinet.  You need to go slow and keep working the rubber lip up over the metal edge front to back , then when you can no longer reach from the inside you go at it from the outside, mm by mm not to fast.  Another way is to just cut the rubber and replace it with a new seal but that takes all the fun out of the project.

On Nov 18, 2013, at 5:34 PM, Automatic digest processor <LISTSERV@GERRY.VANAGON.COM> wrote:

> I've stumped quite a few glass installers when it comes to the left rear
> side window on a Westy.  Only 1 out of 3 was able to complete the job.  It
> took him 3 hours and he swore he'd never do another.

Cheers,    

Frank Condelli
Almonte, Ontario, Canada
'87 VW Westy, '00 Kawasaki 250 Sherpa, "98 Ducati 750 Monster & Lionel Trains (Collection for sale)
Frank Condelli & Associates - Vanagon/Vanagon Westfalia Service in the Ottawa Valley
BusFusion a VW Camper camping event, Almonte, ON, 
June 05 ~ 08, 2014