Odd Buzz? Tighten Your Tuning Machines
String buzz is often attributed to fret issues, but your tuning machines can cause a buzz, too. Your guitar’s tuning machines are typically attached to your guitar’s headstock with nuts at the bottom of the string pegs. These nuts will slowly loosen over time with string vibration. When loose enough, these turning nuts can even cause subtly buzzing, which is often attributed to fret buzz.
Check Once Per Month
Check the tightness of your tuning machine nuts once per month, and if needed, tighten as well. To tighten use an open (non-adjustable) wrench of the correct size and tighten until snug. Do not overtighten.
Do Not Use Needle Nose Pliers
Do not use needle nose pliers to make this adjustment. Needle nose pliers have sharp ends and can easily slip and cause damage to your headstock.