Amazon.com: Gotoh Banjo Tuners (Bonus ALS Fret Polishing Kit) SPBJ4-AIN Model Tuners by Gotoh Japan Set of 4 Nickel with Pearloid Buttons - Fret Polishing Kit by Australian Luthier Supplies : Musical
Planetary Banjo Tuners – Deering® Banjo Company
Tutorial: how I use a banjo tuner on my acoustic guitar. - YouTube