Related:

• After an instrument has been assembled, extra components will be found on the bench.
• After the 16th screw has been removed, the wrong cover will have been removed.
  -- Klipstein's Eighth Law of Productio...
• After the 16th screw has been replaced, the gasket will have been left off.
  -- Klipstein's Ninth Law of Productio...
• After an instrument has been assembled, extra components will be found on the bench.
  -- Mallery's Engineering Truism...
• Tolerances will accumulate unidirectionally toward maximum difficulty of assembly. Klipstein's Law
• A fail-safe circuit will destroy others. -- Klipstein's Fourth Law of Productio