I recently received my F1 slider windshield after talking with Marcel and reading posts on this site. A few minutes after installing the windshield I heard it snap. My fears about the sound proved correct-the windshield was broken at one of the holes. I immediately called Marcel and he told me not to worry that he would send another as quickly as possible. He did exactly what he promised. My only suggestion to him was to include instructions with the windshield to possibly ward off this happening to someone else. Great windshield and greater customer :clap:service.