Maybe we should call this the On The House "safety" tip for today. If you love to tinker, there is something you should know about all cutting tools: They work best when they are as sharp as they can be. A dull power-saw blade has a tendency to bind and can force the saw to jump backward over several of your precious body parts. Unusual pressure must be exerted to make a dull wood chisel cut properly, making it dangerous for anyone standing close by. And, oh yes, a dull drill bit can start a fire and burn out your drill motor. Look in the Yellow Pages under "tool repair" or "sharpening." And that's The On The House tip for today.