bucket of bolts vs juggernaut

bucket of bolts

noun
  • A piece of machinery that is not worth more than its scrap value, often an old car. 

juggernaut

noun
  • A large, cumbersome truck or lorry, especially an artic. 

  • An institution that incites destructive devotion or to which people are carelessly sacrificed. 

  • A literal or metaphorical force or object regarded as unstoppable, that will crush all in its path. 

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