bottom line vs nuts and bolts

bottom line

noun
  • The summary or result; the most important information. 

  • A minimum acceptable result from a negotiation. 

  • The final balance; the amount of money or profit left after everything has been tallied. 

nuts and bolts

noun
  • The basic inner workings of something; the fundamentals; that which makes something operate. 

How often have the words bottom line and nuts and bolts occurred in a corpus of books? (source: Google Ngram Viewer )