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Some headstocks have one or more ''string trees'', which reside between the nut and tuners. These route the strings at a sharper downward angle on the nut, for cleaner tone and better sustain on open notes.
=== Tremelo System - Whammy Bar and Bear Claws ===Some bridges incorporate a ''tremelo system'', which encompasses a number of additional guitar parts. It allows the pitch of the guitar to be altered, usually by a ''whammy bar'' - pushing on the bar moves/pivots the bridge closer to the nut, causing the strings to slack and lowering their pitch. Some bridges allow the bar to be pulled as well to raise the strings' pitch. For bridges that use a whammy bar, the bridge needs counter-tension to prevent the strings from pulling the bridge away from its neutral position. Usually this is done inside a ''rear cavity'' where the bridge connects to ''bear claw springs''. The springs are afixed to a metal clasp which is screwed into the body. Screwing the clasp further into the body increases the tension on the bridge. Tremelo systems also usually include or require a ''locking nut'' or ''locking tuners''. These prevent the strings from unwinding and rewinding differently during a heavy whammy bar dive, which would change the strings' tuning in the bridge's neutral position.
=== Bridge Saddles ===