Ahhhhh! The dawning. That's why it only moves in one direction. For vent the back pops up and stays there. If you open it, it pops up in back and then continues to open. Thanks to both of you and gtsdude, thanks for the picture, it is truly worth 1K words. Back out to the garage.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".