Borg 5

Scorn and distrust between auto mechanics and customers was a problem

licensing auto mechanics was quickly dropped by the industry, which didn't want to pay higher wages.  Never became required.

the next solution was flat rates for doing particular jobs--mechanics resisted this

the next solution was to make repair appear more scientific, with impressive-looking diagnostic and testing machines (mostly combining instruments already in use).  Ford Laboratory Test Set

But auto repair was not scientific, it was done mostly with tacit knowledge

Background: Taylorism
Scientific management was invented by Frederick Winslow Taylor (1856-1915) Taylor's approach was based on the principle of telling the worker how to do the job , but it had several interconnected parts:

  Taylor studying a worker
Taylor thought workers would like this

 Winding Armatures at Westinghouse