A lot of materials were collected for the friction test. This is the tricky part as the material is better to be felt like the finger. The final choice is the sponge-rubber-like material used for the protection from the sharp corner.
There’re three big iterations in the installation structure design. Each one improves the problem of stability, the rotation efficiency, the friction control, and the appearance of the installation.
The music in documentation video:
Top Hat and Cane - Main by John Lenehan, PRS