Compatibility -- Designed for all residential 8-Foot high garage doors, compatible with most residential garage door cable drum. Compatiable cable drum model/part no.: Blesseras GD-01B-001. For Torsion Spring -- work with torsion spring & cable drum -- Each cable has a crimped straight end that allows it to slide into the notch of the cable drum and the other end has a crimped loop-designed to hook onto the bottom fixture's small knob.
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