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 How many positions can the Adjustable Base move into? Can I use a bed frame with my new Adjustable Base? What is Zero Gravity (ZG)? How much weight can be put on the Adjustable Base? Will the Adjustable Base ship with my Helix Mattress?