<p>Few things are more unnerving than sitting on a wobbly chair. If gluing loose rungs and tightening the hardware doesn't work, then add right-angle corner braces. You can buy the braces at hardware and home improvement stores for just a couple bucks for a four pack. Make sure to buy the paintable kind if you want to paint the braces to match the chair.</p><p>"Add a brace where each leg meets the seat. You may have to bend the brace a little so it's flush against the chair leg—you don't want a gap between the brace and the leg," she says. "Be sure to drill pilot holes before inserting the screws through the brace. That'll keep the wood from splitting."</p>