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anti-runback device

Sprag — A sprag is a one way freewheel clutch used in a number of applications. It resembles a roller bearing with rollers shaped like a figure eight and cocked with a spring. When the unit rotates in one direction, the rollers stand up and bind because… … Wikipedia
Sprag clutch — One way bearing combining sprags and bearing rollers in one race A sprag clutch is a one way freewheel clutch. It resembles a roller bearing, but instead of cylindrical rollers, non revolving asymmetric figure of eight shaped sprags are used.… … Wikipedia
Glossary of curling — This is a glossary of terms in curling. Contents: Top · 0–9 · A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #s … Wikipedia
Curling terminology — This is a glossary of terms in curling.# sDuring a game, sweepers might call out numbers. These numbers indicate how far the sweepers think the rock in play will travel. This system is relatively new to the game and is often attributed to the… … Wikipedia