Expandable garden hose review update 02:46 There's a new breed of as-seen-on-TV expandable garden hoses that promise to be lighter, easier to use and will never kink. Consumer Reports checked out ...

Self-locking results from the small lead angle of the worm threads, which produces high frictional forces at contact. A multi-start worm has a higher lead angle and as a result is less likely to be ...