Spherometer for 9.5 mm Dial Indicator

This remix of Georg's spherometer accommodates larger shafts, like the Pittsburgh dial indicator. I've made the inner hole a bit wider, and made the height taller to accommodate the longer shaft and improve balance. All fasteners are M3. 

I use an M3 knob to secure the indicator, which can be downloaded here: https://www.printables.com/model/205691-m3-knob