Hurling a sledgehammer at the dry wall is a handy way to add storage space for a growing collection of books, beanie babies, or sledgehammers. Explore subtler household improvements with today's Groupon: for $10, you get $20 worth of hardware supplies, home accessories, and services at Tessier's General Store in Pawtucket. An old-fashioned shop that's been around since 1917, Tessier's stocks its shelves with supplies to aid your inner electrician, painter, or plumber. Wire the house for fire warnings with a First Alert smoke alarm ($12.95) or use Zinsser's 1-2-3 primer to prep your walls for a new chapter in their Colors We've Been book ($17.95). The barn-shaped building teems with hand tools, power tools, and various fix-it items, and experienced staff members stand ready to answer detailed home-improvement questions or offer advice for getting the raccoon out of the toilet. Today's Groupon is also valid for services offered by Tessier's, such as cutting glass or carving new car keys out of styrofoam blocks.