If your glass sliding doors move in a stiff or unwieldy manner it may be time to replace the rollers on the bottom of the door.
Sliding glass panel door roller.
Most sliding glass doors contain two sets of rollers one on each side of the bottom of the door.
This video will show you how to replace the wheels rollers on a sliding glass patio door.
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Replacing rollers is not a difficult task but you will need to remove the door from its frame.