Rubik's Magnetic Cube prototype: 3/16" bit/stop
That's one of the 125 3/16"x3/16" D32 neodymium magnet from K&J Magnetics on the 3/16" bit with 3/16" stop wrenched onto it. I wanted just a hair deeper of a cylindrical hole than the magnet, so they would all sit slightly below the level of the face of each acrylic cube. I used the magnet to line up visually the depth of the stop here. This didn't work as I hoped, for reasons explained in the next pic.
Rubik's Magnetic Cube prototype: 3/16" bit/stop
That's one of the 125 3/16"x3/16" D32 neodymium magnet from K&J Magnetics on the 3/16" bit with 3/16" stop wrenched onto it. I wanted just a hair deeper of a cylindrical hole than the magnet, so they would all sit slightly below the level of the face of each acrylic cube. I used the magnet to line up visually the depth of the stop here. This didn't work as I hoped, for reasons explained in the next pic.