Bass string winders. These tools can quickly and easily detune and tighten your bass strings when changing. This can be a surprisingly tedious process and uncomfortable for your hands, and these cheap tools can make the whole thing quite painless- particularly for upright bass.
Acoustic Electric Guitar Bass Peg String Winder Head Pin Puller Tool Dia.6mm
Acoustic Electric Guitar Bass Peg String Winder Head Pin Puller Tool Dia.6mm Price: $1.44
Guitar Bass Peg String Winder Head Tools Bridges Puller Drill Hexagonal RemoveSH
Guitar Bass Peg String Winder Head Tools Bridges Puller Drill Hexagonal RemoveSH Price: $5.65
D'ADDARIO PLANET WAVES DP0002B BASS PRO-WINDER RE-STRINGING TOOL
D'ADDARIO PLANET WAVES DP0002B BASS PRO-WINDER RE-STRINGING TOOL Price: $10.99
Planet Waves Bass Pro-Winder String Winder and Cutter
Planet Waves Bass Pro-Winder String Winder and Cutter Price: $11.88
D'Addario Planet Waves Bass Pro-Winder String Winder and Cutter, DP0002B
D'Addario   Planet Waves Bass Pro-Winder String Winder and Cutter,  DP0002B Price: $10.99