A soda straw is used to form a spindle that supports the disk carrier. Card stock is wrapped around the soda straw to make it thick enough to fit firmly into the center of the bearing.  The spindle is then inserted into the bearing hub.

Assembled Spindle & Bearing

The assembled spindle and bearing assembly is then inserted into the mounting base. The spindle is first inserted into the hole in the center of the mounting base lid.

Spindle and Bearing Inserted into the Mounting Base

The lid is then placed on the mounting base shell. As the lid is placed on the mounting base shell, the spindle is inserted into the second hole in the mounting base insert. This stabilizes the spindle and ensures that it remains in a vertical position.