Ex German Test Equipment (Rohde & Schwarz)
The manufacturer of this knob is not indicated anywhere on the body but there is no way Rohde & Schwarz would have used Asian sourced knobs on their equipment!
Collet knobs are commonly used in professional equipment because there is no spline fitting or grub screws which can become loose over time.
Collet knobs have an all metal centre fitting which grips the control shaft tightly and once tighened they will not let go!
To access and fit a collet knob ...
Flip off the top cap, this top cap can be changed with other coloured top caps (if you have the same type) - see my LIGHT GREY top cap knobs HERE
Unscrew the central bolt and the knob can then be slid onto or released from the 1/4" control shaft
EUROPEAN MANUFACTURED (MAKER UNKNOWN) - Equipment Knob
Collet Knob with top cap
All metal grip mechanism, brass or copper
Mid blue top cap with a light grey body
Two flanges 180 degrees apart provide a secure grip for the user
Black pointer lines on both the body and the top cap
15mm diameter knob
14mm height
Collet intended to fit a standard 1/4" shaft (usually a pot or switch)
