The place I've seen this is actually on a certain generation of the apple laptop power adapter. http://km.support.apple.com/library/APPLE/APPLECARE_ALLGEOS/TS1

The place I've seen this is actually on a certain generation of the apple laptop power adapter. http://km.support.apple.com/library/APPLE/APPLECARE_ALLGEOS/TS1725/TS1725-7.jpg http://km.support.apple.com/library/APPLE/APPLECARE_ALLGEOS/... Found under "7. Check for strain relief issues." on this page: http://support.apple.com/kb/TS1725 http://support.apple.com/kb/TS1725 I always thought it was a great idea, but they didn't use it for long so it must have drawbacks. [edit] I believe it was used on the aluminum powerbooks.