Do I need to use the retainer bar that was provided? August 12, 2020 14:04 The retainer bar secures your mattress in place while using the Adjustable Base. Related articles What is the Helix Frame? How long will it take for my order to arrive? Shipping timelines? How many positions can the Adjustable Base move into? Can I use a bed frame with my new Adjustable Base? How much weight can be put on the Adjustable Base?