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Insert the string through the post hole, wrap around once, then lock by tightening with the thumb screw. Locking machine heads utilize the famous 18:1 Rotomatic design with a "thumb screw" mechanism. Perfect replacement for the most standard machine heads. Chrome, 3 Per Side. Includes all mounting hardware. Mounting screws and threaded hex peg head bushings with washers are included.10mm-diameter (13/32") peg holes required