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:
https://www.chamberlain.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/114A2728.pdf
Mike Draper discusses how he likes to clean windows with watered pole to effectively clean stacked glass.
Location: Ventura
Get up to the top and thoroughly scrub and clean the frames and knock out cobwebs, etc. Then drop to the bottom and clean a 3rd of the way up wetting the window and giving it some aggitation and giving a few seconds for the top area to drip out. Then go back up and stay about 2-3 inches from the top of the window to not push any more water into the glass then finish out the window with an S rinse.
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