I have seven-foot, freestanding wooden bookcase in my home that wobbles a bit. It's only a slight wobble, but it makes me nervous and I'd like to reinforce it somehow to make sure the sides stand perfectly straight and it doesn't get worse. I remember once reinforcing the sides of a wooden bed frame using some sort of thin steel connectors, so I was thinking about trying something along those lines. The case has an open back, so it will have either be hidden behind the shelves or aesthetically pleasing. I can't bracket the piece to the wall. I need advice about what to do and where to get the materials. Simply replacing the bookcase is not an option.