ball bearing on the rollers, a quick four second spray and that’s all you need. that is where the stress is, not the rails. when the door is up, check the rollers and make sure they look straight and are not pulling to the center of the door.
so where else can you use tri flow? on anything that squeaks. hinges in the home and your car that are annoying, give them a quick spray of tri flow. if you have a sliding glass door or mirror door that drag and are heavy, move them easily with a spray of tri flow on the rails. tri flow comes in four convenient 