Windshield sealing? lock strip

here is where the round rubber locking seal goes. The gasket should have been a zipper over locking folding type, but I have seen a lot lately made this way?

Here is the tool [ame="http://www.amazon.com/Lisle-47000-Windshield-Locking-Strip/dp/B000COA1CQ"]Lisle 47000 Windshield Locking Strip Tool : Amazon.com : Automotive[/ame]