fulcrum

noun2

1. •
   The support about which a lever pivots.

   • It is possible to flick food across the table using your fork as a lever and your finger as a fulcrum.
2. •
   (figurative) A crux or pivot; a central point.

   • By this point the fulcrum of concern is the stuprum of men upon men, described as more prevalent than that upon women. — 2006