Hyphens, En Dashes, Em Dashes

Q. For Chicago style, is there a mandate on whether a paper clip or staple should be used?

A. In manuscript preparation, paper clips work well; binder clips and rubber bands are ideal. Such WMDs as staples should never be used. Never. If one lands on your desk, it should be dismantled immediately. [SAFETY ALERT: Proceed with caution. May result in torn documents and/or personal injury unless performed by a professional trained in the use of the proper device (and probably even then).]

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]