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     Ed,
     
     The vast majority of fasteners use a plain flat washer against the
     non-rotating component and a lock washer against the rotating
     fastener.  There are however exceptions to this with plain washer only
     installations and fasteners with no washer of any kind.  The Lycoming
     parts manual spells out what combination is used for every fastener on
     the engine.
     
     Chris Zavatson
     N91CZ