Modern reclining sofa arms are basic. It is nothing more than a wooden, metal or plastic arm attached to a 1/2 inch square drive. When you push or pull on the arm, it turns the shaft in the seat to fold the footrest up or down. Attrition can take a toll on the arm, so that the screws that to release the arm or slip. The footrest might work, but the arm is so loose that it feels like it could fall. If not attended to, it will completely fail. Tightening the arm to virtually any modern reclining sofa is easy, and you can do it in a few minutes.
How arm on a modern reclining sofa Turn, Pull the lever, if possible, to raise the footrest. Place to prevent an object under the footrest that they are up or down. If you cannot get up the footrest, because the arm is too loose, turn upside down the bank. Pry one or two wooden or metal caps around the circumference of the arm where it attaches to the side of the bank. There is a cap on each side of the arm. Use the tip of a screwdriver to pop the caps to reveal screws or bolts. If there are no caps, search for a single hole in the bottom of the arm; It has no cap.
Arm on a modern reclining sofa Turn, Tighten the screws with a screwdriver. If no screws, use a 3/8 inch socket and ratchet bolts tighten eye. Place the caps back in the holes. Tap them down tightly with the back of the screwdriver. Remove any objects from underneath the footrest or tip the bank afloat.