In 1812 Peter Galliard invented the lawnmower. Later, others added a gas engine, and a tough chore became a lot easier. Spring's almost here. Soon it will be time to bring your mower out again; but after a long winter's hibernation, there are things to do before firing it up and taking it out for a spin. First, remove the spark-plug wire. Then check the blade for sharpness and balance. If dull, remove it and sharpen with a file. To check balance, put the center hole on a screwdriver or your fingertip. The heavy side will be lower. Just keep filing till they balance. Also, clean the housing inside and out. Lubricate all moving parts including wheels, and then fire it up. Don't use last year's gasoline; it will gum things up. Remember safety, too. Before you hit the turf, check for debris that can become deadly missiles. With a little care and extra effort, you will have a beautiful lawn all summer long and be around to enjoy it. And that's the On The House tip for today.