What is this metal circle on the front face of my guitar headstock called, that the strings wrap around. One of them has fallen off and I don't know where it is
![How to Setup an Electric Guitar for Drop C Tunings and low Heavy Metal Tunings - Guitar Repair Bench How to Setup an Electric Guitar for Drop C Tunings and low Heavy Metal Tunings - Guitar Repair Bench](https://www.guitarrepairbench.com/electric-guitar-repairs2/images/drop-c-guitar-tuning.png)
How to Setup an Electric Guitar for Drop C Tunings and low Heavy Metal Tunings - Guitar Repair Bench
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