502C Roto-Grip Locking Rotomatic Tuners, 3-Per-Side, Chrome, Insert the string through the post hole, wrap around once, then lock by tightening with the thumb.., By Grover - Walmart.com
Grover Rotogrip 502C Chrome – Thomann United States
Grover Original Locking Rotomatics (106 Series) 3+3 Tuners - StewMac
NEW Grover 502 LOCKING Tuners 3x3 Modern Gibson Les Paul KEYSTONE Buttons CHROME | eBay