Photo Karim Shamsi-Basha
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Stand the assembled staircase in the opening and have someone support the base as you climb up part way. Grab the top of the stringers and squeeze them in until the slide bars on the header-guide frame slip into the channel grooves on the outside of the stringers. Now install the top three stair treads. Slide the steel door-guide frame onto the staircase, then attach it to the door panel with six 1-inch-long screws.























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