How do I adjust the leg height on the Mattress Firm 300 base?
Push the pin inward to adjust the leg height, and set it between 6 and 10 inches to ensure the base is level on the floor. The base has six legs total — four at the corners and two at the center support brackets. (Page 2)
From the official Mattress Firm 300 Series Adjustable Base manual, page 2
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