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{{main|machine head}}
Pegs for [[double bass]] and [[guitar]] family instruments are usually geared, and are called tuning machines or [[machine head]]s. They often use a [[worm gear]]. The [[Gear train#Speed ratio|gearing ratio]] varies; while higher ratios are more sensitive, they are also more difficult to manufacture precisely. Machine heads may be open, with exposed gears, or closed, with a casing around all the gears.
Geared pegs for [[violin family]] instruments also exist, although they have not gained wide use, which has to do with the extensive and irreversible physical modification that must be made to the peg box in order to mount them, which is often viewed as ruining the aesthetics of the instrument, combined with a bad reputation they acquired due to poorly designed early models that were prone to failure, often with catastrophically damaging results.
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