Replacing a Screw Drive Carriage Rack in a Lift-master Garage Door Opener
Replacing the screw drive rack on a Lift-master Model 2000SD 1/2 HP. The part number I ordered from Amazon was a "Liftmaster 81C168 Garage Door Screw Drive Carriage Rack" The link to detailed instructions that I followed (more or less) from Chamberlain.com are: http://www.chamberlain.com/CatalogRes...
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