Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:6280812.

These wedges are used to center the mounting bar for the playfield monitor in a virtual pinball cabinet. If you've been following Way of the Wrench's Youtube video series on building a virtual pinball cabinet, you saw that he used a wooden dowel that the playfield monitor rotates on. He also made centering wedges out of wood. I am less skilled in making the wedges be the same so I decided print some.

The OpenSCAD script should be easy to customize for your cabinet.