This black nut is designed for use with Omeg potentiometers,
68-1946
Suntan TSR-3296W-103R 10k Wr3296W 10% 3/8 Cermet Trimmer Pot
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Suntan TSR3386F-EY5-103-TR 10k 3/8 1-turn Finger Adjust Pot
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Taiwan Alpha RV16AF 10K LIN 16mm Metal Case PCB Potentiometer
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Royal Ohm CFR0W4J0103KIT 10K Carbon Film Resistor 0.25W - Pack of 100
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10k 0.25W Royal Ohm Metal Film Resistor 100pc Cut Tape
from only£1.97