About Nicopress fittings.  This video explains the procedure, tools and verification with a gauge of a correct installation.  https://www.youtube.com/watch?v=jED1HoklilU  Note the spacing of the crimps on the sleeve.  The photo of “the right cable which didn't fail” is not a correct crimp and is much weaker.  In my former life, as a simple yacht merchant, our shop made sailboat rigging.  If a nicopress is done right and installed correctly (this is important too), I would say it is not possible to push hard enough with your foot to cause it to fail.  If cable flex is occurring at the fitting, all bets are off.  

Steve Colwell  Legacy