A grubby sliding strip showing why the C-Dory windows lose their slipperiness. Installation is the reverse of removal, but getting the plastic strips to set back in right was time consuming. They "click" in to place when everything is lined up properly. The little tempered glass replacement was about $100 and took a couple of days. The glass shop in Seattle had to send it out to get the right thickness of tempered glass cut with rounded corners.