10pcs Soft Hard Rubber Half Shaft Potentiometer Knob Cap D-axis Cap Plastic Type D For Ky-040 Module Diy Electronic 6mm Black - Integrated Circuits - AliExpress
10pcs WH148 Potentiometer Knobs 6mm dia Shaft Hole control knobs caps – diymore
Green Micro Potentiometer Knob - 4 pack : ID 5535 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits