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Movable Pulley: A pulley that rotates and interprets in accordance to the movement of the pulley or belt. This is generally employed in blocking and deal with methods, which I will make clear afterwards.
Roller: A standard pulley has a slot for a belt, chain or cable. A reel is a wider pulley frequently used in cable programs, permitting the cable to be wound close to several instances the diameter of the reel.

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