Review on Flexible Black Rubber Thread Protectors for Enhanced Durability and Protection by Justin Woolley

These screw caps are just what I need for my storm door. The pin that held the window to the door kept falling out of the groove. I'm not sure why, either the pin was too short or its track was perfectly aligned. I put one of those caps on the end of the pin and now it's holding the window in the rail. The door is black so you can't see it.