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Sound Devices MixPre knob
Specs: 12mm diamater, 12mm height, 8.5mm internal diameter
The knob is friction-fitted on the original knob, no need to modify your device.
Download version 1.0 (*.stl)
Extending the knob increases risk of damaging the original encoder when dropped, since the knob is protruding over the edge of the protective corners. Use at your own discretion.