Summary
This is to replace the encoder knob on a Tektronix CRO.
It uses a 4.5mm ball bearing and a spring from a pen cut to the length of the circular hole.
The base (part1) is stuck on with using double sided tape.
See more what I have done: http://tinkersprojects.com/
Tektronix CRO encoder stepping knob 3D Print Model
