CONTROL KNOBS :
All control knobs are poured, drilled, tapped and painted with a white line by hand at POM AUDIO DESIGN :

control-knob-makingknob-makingline-painting

All Control knobs on the FAIRCHILD 670 mkI and mkII can be adjusted with the help of a metric M2 Allen-Key :
RS Stock number : 609-578

m2-allan-key
(Supplied with every FAIRCHILD 670 mkI and mkII)