You're ready to mow, but your mower won't go. Here's a small-engine $1 fix to add to your bag of tricks. Lots of outdoor lawn and garden equipment is powered by a small gas engine -- mowers, blowers and trimmers, to name a few. By and large, they're reliable, since there's little to go wrong mechanically. However, every so often, they won't start. To avoid this kind of frustration -- besides using fresh gas and checking the oil periodically -- be sure to change the spark plug every year. It's the most common cause of mowers failing to start. You can purchase a small-engine spark plug at any automotive store for about a dollar. For more tips, visit our Web site at onthehouse.com. And that's the On The House tip for today.