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Engraved Measurement Markings: Each professional-grade measuring cup and spoon is meticulously crafted with engraved markings for both standard US measurements and their metric equivalents
Gears are not available for openers manufactured prior to 1984
Install Sprocket onto door shaft with key and set screws
manufactured 2022
can cause serious injury
Opener Square Rail Trolley Kit SHOP BY SPRING SIZE_.218-2-27 Engraved Measurement Markings: Each professional-grade41C5141 1 is a Square Rail Trolley Replacement Kit. For use with various LiftMaster and Chamberlain Chain Drive Garage Door Opener Rail Assemblies. The square rail trolley is used for travel on the garage door opener rail and connects the door arm to the chain drive mechanism. Check the owner's manual or replacement parts diagram for specific part information before ordering to ensure compatibility. Also known as: 062313, 41C5141, 41C51411
