linchpin

/'lintʃpin/
Noun
  1. pin inserted through an axletree to hold a wheel on
  2. a central cohesive source of support and stability
    • faith is his anchor
    • the keystone of campaign reform was the ban on soft money
    • he is the linchpin of this firm

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linchpin
The mechanic inserts the linchpin to secure the wheel on the axle.