Chair braces are an easy fix for a wobbly chair. They're better looking and much stiffer than L-brackets. Most hardware stores carry chair braces in finishes like chrome, brass or bronze. To avoid splitting the wood, be sure to drill 1/8-in. pilot holes before driving in the screws. If appearance doesn't matter, screwing a brace or T-plate onto a piece of furniture is often the quickest way to fix it. Adding metal may not make the piece totally sound, but at least it won't come apart.