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Grover black replacement tuning machine buttons as used on the 309 series.
Please Note: Grover tuning machines produced prior 1985 use different specifications for threading and shaft sizing. Current production replacement parts are not interchangeable on vintage (pre-1985) Grover tuning machines.
While these buttons are very well made, they do not, unfortunately, fit the Grover 309-series F-style tuners with pearloid buttons currently on my mandolin. These buttons have square holes, whereas the shafts on the 309 tuners are flat on two sides and rounded on the other two. Shame, because the pearloid buttons look cheap compared to these black buttons.
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