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connect the garage door to the garage door opener trolley
Compare your parts to the picture above
Garage Door Key Release Entry Screws included with 2x keys
Install bracket to wall on JR-ST- or JRG if desired to keep unit from swinging
The square rail trolley is used for travel on the garage door opener rail and connects the door arm to the chain drive mechanism
Garage Door Extension Spring For 7'Ft.- 140 lbs Dark Blue SHOP BY SPRING SIZE_225-1-3/4-29 connect the garage door toGarage Door Extension Springs for 7' High Single Loop Professional high tensile steel, Rated 10,000 Cycles 25" relaxed; will stretch to 42" Note: These springs are for use on standard sectional doors only, The only way to get the proper extension spring is by door weight.. we recommend using a bathroom scale to weigh the door before ordering.. we cannot tell you what your door weighs from a description of the door
