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SparkFun sell the bits and pieces to make your electronics projects possible. No matter what your vision is, their products and resources are designed to make the world of electronics more accessible to the average person.
Knobs are a great way to finish off your project and make it easier to adjust the level of your death ray. This knob mates to a 0.25" shaft with a set screw.
Do you need that extra push over the cliff? The GTE (Goes To Eleven) Knob can fit onto potentiometers with a 6mm wide shaft thanks to a brass insert with a set screw.