The AllModern Elsmere Upholstered Convertible Sofa doesn't have a mechanism, just unclip the leather straps around the back cushions to expose more mattress space. We benefit from the simplicity from the hybrid system on our best value pick, the Posting Nordby Pep Sofa Mattress much too. Long-Lasting Frame Development Sleeper https://zanderxodsg.smblogsites.com/31021118/what-does-queen-base-beds-mean