My dial indicator is 57mm and a large top protrusion, so I changed it to 57mm diameter - only 1 bolt is needed for retention.
Print orientation IMO is best face down, with the retention tabs sticking up.
Remember to home your printer before mounting this, or it'll crash into the front door.
The author remixed this model.
Modifed for 57mm Dial Indicators with a large top protrusion. Also modified the retention system to make it easier to remove without breaking off the tabs.