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Some pegs and pins are threaded with a shallow, [[fine adjustment screw|fine thread]]. They are not tapered, but straight, and they go into straight-sided holes.
Like tapered pins, threaded pins must be set in a pin block of fairly hard wood, such as [[cherry wood|cherry]] or [[white oak]], or they will not stay in tune well.<ref>http://www.sligoharps.com/8book.pdf {{Bare URL PDF}}</ref> Some pin block woods come from endangered trees.<ref>{{cite web |url=https://www.wood-database.com/wood-articles/restricted-and-endangered-wood-species/ |title = Restricted and Endangered Wood Species {{!}} The Wood Database}}</ref> Some specialized plywoods can also be used (piano pin block stock or the die maker's ply used for [[rotary die]]s)<ref>http://www.sligoharps.com/2book.pdf {{Bare URL PDF}}</ref>
Threaded tuners are durable, will take very high string tensions. They do not push outwards on the hole and wedge the wood apart, which can reduce the risk of splitting it. They can be set in [[blind hole]]s, which allows the wood to retain more strength for a given weight.<ref>{{cite web |url=http://folcharp.com/zitherpins.html |url-status=dead |archive-url=https://web.archive.org/web/20080724215944/http://www.folcharp.com/zitherpins.html |archive-date=2008-07-24 |title=FolcHarp - Zither pins}}</ref> They can, however, also be set in holes drilled right through the wood, to look like older pins. Threaded pins can be installed with an [[arbor press]], and do not need to be re-set, but should be backed off a few turns when changing a string to keep pin height even.<ref>{{cite web |url=https://manufacturing.dustystrings.com/harps/accessories-hardware/hardware/threaded-tuning-pins |title = Threaded Harp Tuning Pins {{!}} Dusty Strings}}</ref><ref>https://manufacturing.dustystrings.com/application/files/2014/7516/8049/Replacing_Harp_Strings.pdf {{Bare URL PDF}}</ref>
===Use===
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Fine tuners are used on the [[tailpiece]] of some stringed instruments, as a supplement to the tapered pegs at the other end. Tapered pegs are harder to use to make small adjustments to pitch.
Fine tuners are not geared. They have a screw with a [[knurl]]ed head, whose lower end advances against one end of a lever with a right-angle bend in it. The string is fastened to the other end of the lever, and tightening the screw tightens the string.<ref>{{cite web |url=https://www.violins.ca/info/tune_a_violin_fine_tuners.html |title = How to Install and Use Violin Fine Tuners}}</ref> With the screw at the lower limit of its travel, the lever can come close enough to the instrument's top to pose a risk of scarring it.<ref name=strings_finet>{{cite web |url=http://stringsmagazine.com/how-to-select-the-right-fine-tuners/ |title = How to Select the Right Fine Tuners {{!}} Strings Magazine}}</ref> To avoid damage to the top, the screw may be turned out as far as it goes while still engaging the lever, and the string re-tuned using the peg.<ref>{{cite web |url=https://www.dummies.com/art-center/music/violin/troubleshooting-guide-for-dealing-with-violin-pegs-and-fine-tuners/ |title = dummies - Learning Made Easy}}</ref>
Fine tuners can buzz, and may cut strings if not filed smooth before use. They add weight and, when not built into the [[tailpiece]], reduce string afterlength.<ref name=strings_finet/> Fine tuners are common on cellos, but some violinists regard them as an aid for beginners who have not yet learned to tune precisely using pegs alone.<ref>{{cite web |url=http://blog.feinviolins.com/2011/04/fine-tuners.html |title = The Violin Shop: Fine Tuners}}</ref>
==Geared tuners==
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