lynchpin

  1. a central cohesive source of support and stability
  2. pin inserted through an axletree to hold a wheel on

lynchpin

A linchpin (occasionally lynchpin) is a metal part used in mechanical engineering to prevent a wheel or other rotating part from sliding off the axle it is riding on.
Found on http://www.encyclo.co.uk/local/20708

Lynchpin

Male Sydney funnel-web Spider photographed November 2004 at the Reptile Park at Gosford. Photo by www.takver.com Released under the GNU Free Documentation License ...
Found on http://en.wikipedia.org/wiki/Lynchpin

Lynchpin

A critical unit, that if taken out seriously jeopardizes chances of victory. Competitive lists try to ensure redundancy, and avoid having a single lynchpin unit.
Found on https://www.reddit.com/r/WarhammerCompetitive/comments/6ppyu3/a_glossary_of
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