What's the most important mechanical device ever invented?

screw 1 of 6 simple machines, other 5 being lever, wheel , axle, pulley, inclined plane, , wedge. 1 of commonly used device in world. screw has appearance of thin metal stick turning head on top , grooves along length. conventionally, defined "a mechanical device has helical inclined planes , capable of converting torque linear force , vice versa". helical inclined planes, present on screw, referred 'threads' or 'threading'. structure, space, size , material of screw made of determines strength. strength referred mechanical advantage. turning head of screw provision or facility force screw driver can applied , torque can generated.

stephen fry reckons it's disposable pocket lighter. perhaps it's button? suggest mechanical clock.

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