Boeing 737 EFIS Knobs

Bottom knob with 6.5mm hole to fit standard rotary switch (M3 set/grub screw). Top knob 3.1mm hole to fit 3mm brass shaft to create dual concentric switch/encoder. Hole needs to be drilled through the rotary switch to make it work.

More info on my 737 project: https://www.facebook.com/sum1els737