Check the listing for details. Golden Age A-style Mandolin Tuners, Relic brass with ivoroid knobs. Condition: New. Listed at 108.64 USD. Golden Age A-style Mandolin Tuners Completely redesigned! Improved tuning for vintage-style mandolins, without giving up the authentic look. We have completely redesigned our Golden Age mandolin tuners! Under the direction of StewMac's Don MacRostie, renowned mandolin maker, we've brought back classic features of tuning machines from the pre-World War II era.F-Style models also available.The look of the old, the reliability of the new.The look is more authentic than ever, but close-tolerance specifications, nylon worm bearings, and 15:1 gear ratio make Golden Age tuners smoother and more efficient than vintage machines ever were. Two optional relic finishes duplicate that "well-played" patina that makes most other modern tuners look johnny-come-lately on a vintage or reproduction instrument. The distinctive Loar-shape steel baseplates even have the same footprint and engraving as originals.The details are 1920s too: Old-style string post shape Square worm supports Straight-slot worm gear screws Roundhead straight-slot mounting screws Vintage-shape black or ivoroid knobsEach set includes: Pair of 4-left, 4-right tuning machines Press-fit peghead bushings Mounting screws Gear ratio15:1 String post diameter0.236" (6mm) String post spacing29/32" standard (23mm) Required peghole diameter.336" (8.53mm) Installation Tips Peghole spacing: Plate-mounted tuners can't work efficiently if the pegholes are improperly drilled. Bushings: We recommend the #2061 Bushing Reamer Mounting screws: Pilot holes required. Installing delicate screws into hard wood requires great care and accuracy. We recommend the #1714 Depth-stop Drill Bit