Emerald Guitars - 7 string headstock with Gotoh 510 tuners Check out all the details on the custom 7 string Spalted Chen Chen here https://emeraldguitars.com/product/x20-7-spalted-chen-chen-4777/ | Facebook
Genuine Original 7 In-line Gotoh Sg381-07-mgt 7 Strings Guitar Locking Machine Heads Tuners ( Chrome ) Made In Japan - Guitar Parts & Accessories - AliExpress
How to Change Strings with GOTOH Locking Tuners and a Floyd Rose (7 String) – Jason Stallworth