> Why? Must be a good reason.
I've not read Carroll Smith's book yet, but IMO one good reason for using a
flat washer is to spread the load whenever the underlying material is
softer/weaker than the nut. Sheet metal or aluminum always gets a flat
washer. 'Split' lockwashers also tend to tear up castings, so use a flat
washer there, too.
Randall
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