What is this extension on the scroll of a double bass? - Music: Practice & Theory Stack Exchange
Double Bass C-Extension: The Upton Bass Low C Extension
File:Double bass C extension.jpg - Wikipedia
How Double Bass Extensions Work | For centuries, composers and performers have experimented with various tunings and numbers of strings on double basses. While the standard double bass... | By Double Bass HQFacebook
Does anyone know the manufacturer of this machine extension? : r/doublebass
How exactly should you tune with a C extension? : r/doublebass
Double Bass C-Extension: The Upton Bass Low C Extension
Quantum Bass Center's C extensions - QUANTUM BASS CENTER
Double Bass C Extensions: FAQ | Anzellotti Bass Capos