Attached is an image of one of the two white nylon/plastic parts that is at the top of the sliding glass door (between the wood on the door and the aluminum upper guide. You can see the nylon is worn down near the screw. This worn out part appears to have caused the aluminum frame to wear about 1/16 of an inch. The wear on the aluminum upper frame is a 1/16 inch deep groove where the screw apparently now rubs against the aluminum frame.
What is the name of the part? Do you sell it? Can you provide a link where I can find it.
