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The square rail trolley is used for travel on the garage door opener rail and connects the door arm to the chain drive mechanism
1 wall bracket and a 1/4" key External chain
Steel 1' bore
041A5047-2 is a header bracket installation kit that is compatible with various garage door openers
Garage Door Torsion Spring .243 x 2 x 31' Pair SHOP BY SPRING SIZE_.243-2-27 The square rail trolley isThis pair torsion springs come in a green finish with a 0. 243 wire size and a 2 inch inside diameter, 31' inch length. Spring includes winding and anchor cones installed. *We recommend changing the cables when replacing the springs (See Garage Door Cable) Click here for information on how to measure torsion spring WARNING DISCLAIMER Garage door torsion springs, cables, brackets, and other hardware attached to the springs are under very high tension
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