2 Hinges: A type of joint that attaches two things with each other but lets one of them to swing backwards and forwards, for instance a door attached into a door frame If rollers are appropriate and you might want to adjust the tracks, then loosen the bolts around the http://garagedoorofftrack11111.bloguetechno.com/Helping-The-others-Realize-The-Advantages-Of-Garage-Door-Off-Track-Repair-38278166