idle pulley

Noun
  1. A pulley on a shaft that presses against a guide belt to guide or tighten it (synset 103565179)
    is a type of: block, pulley, pulley block, pulley-block - a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
    same as: idle wheel, idler pulley

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