The arm of our Karlstad sofa recently hit the bricks and not wanting to buy a new couch, we removed the old hardware, created a new wood brace to fit inside the frame, and used new bolts to secure the new, reinforced arm to the body of the couch.
We have a full step-by-step tutorial over on Instructables with lots of pictures, hints, and measurements for the wooden brace.
We couldn’t find any repair ideas for our Karlstad, but knew this was a common problem. Thought it might be helpful to others!
~ Jessica Schillinger