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Viewing picture 3 of 5   (file: rotary20030929684.jpg)

Description: 

I cut out two 4.5x4.5cm pieces of PCB, layed them on top of each other (so they have all the wholes exactly at the same spots) and drilled four holes for the threaded rods, a 10mm hole for the rotaries and a 3mm hole for the notch of the rotary (to fix it).
I drilled out the plastic axis of the first (outer) rotary and replaced it with a piece of aluminum pipe. Through that runs a 4mm brass rod for the inner knob to the other rotary. There, I drilled a 4.5mm hole into the plastic shaft, stuck the brass rod in. Then I drilled through both the plastic and the brass rod a 1.5mm hole and put a small nail through that hole.
 
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