Sliding Glass Door Roller
I have a forty year old 48"Wx80"L sliding glass door that's difficult to slide back and forth and "catches"/makes a scraping sound in a certain spot halfway across the track. The top of the track is bent slightly downward in the middle due to 40 years of house settling. I'm shocked at the high cost of roller replacement (parts plus labor close to $300 for a 1.5hr job). Is this something a "handyman" with a suction cup can do? I would hate to pay $300 only to find out that the door doesn't slide any better because the upper track is slightly bowed in the middle. How does one know if it's a roller, track or setting issue causing a door to slide poorly?