Backside

Konstruiert und fotografiert von Willem Evert Nijenhuis.
Hochgeladen am 7.3.2016, 12:45 von winijenh.  6 / 16

This is what the backside looks like: 7 neatly spaced shafts. They need to be turned 90 degrees clockwise or counterclockwise is order to switch a segment from red to yellow or vice verse.