Hi Bob,
Sorry for my slow response as I had no luck in taking window-scrapper pictures to show how an original strip was installed. Since, for some reason, I could not get a sharp pic to transmit, I will just tell you that the window-scraper strip extends to the vertical support of the vent window and no further. When the window is lowered, the pressure applied to the window by the strip is released. The strip is allowed to withdraw toward the inside edge of the window channel in the vertical vent support.
Hope this helps. Without the pictures, the description becomes a little wordy.
All the best,
Ray (64BJ8P1)