Rotary knob with marker for 4-mm axis The cross-cut collets in the knob body are pressed around the full circumference of the potentiometer/switch nuts with a secure and non-slip fit by tightening the hexagon nut. The shiny, conical knob body is roughly notched around the circumference for secure operation. The collet chuck is sealed by the cover. Please order cover separately! https://elecena.pl/product/9694595/332-41-rotary-knob-with-marker-for-4-mm-axis-note-please-order-cover-s 2017-08-05 https://elecena.pl/product/9694595/332-41-rotary-knob-with-marker-for-4-mm-axis-note-please-order-cover-s 2018-01-25 https://elecena.pl/product/9694595/332-41-rotary-knob-with-marker-for-4-mm-axis-note-please-order-cover-s 2018-12-16 https://elecena.pl/product/9694595/332-41-rotary-knob-with-marker-for-4-mm-axis-note-please-order-cover-s 2019-04-02 https://elecena.pl/product/9694595/332-41-rotary-knob-with-marker-for-4-mm-axis-note-please-order-cover-s 2021-05-21 https://elecena.pl/product/9694595/332-41-rotary-knob-with-marker-for-4-mm-axis-note-please-order-cover-s 2022-06-10 https://elecena.pl/product/9694595/332-41-rotary-knob-with-marker-for-4-mm-axis-note-please-order-cover-s 2023-04-26 https://elecena.pl/product/9694595/332-41-rotary-knob-with-marker-for-4-mm-axis-note-please-order-cover-s 2023-09-29