OK - had an assy with glass and spring gone - place the end of the division bar on the ground, open the vent alla way, hold down on the top of the glass frame while pulling up on the surround frame until you get the pin to come free of the hole and push past the rubber -
yer uncle Bob .... not as easy to get back together .... the 'next' pic shows the recessed rivets that come out to replace the [rigid] vertical rubber ... the pic after that is the pair I rebuilt for my panel project, replaced the division bars with new ones, had to drill all the holes and replace all the rivets, NO fun, just hafta keep at it

Bill