fiddle with vs twiddle

fiddle with

verb
  • To manipulate an object, especially in a nervous or restless manner. 

  • To adjust the position, as of an electronic device, in order to provide better reception or signal. 

  • To manipulate in order to gain something for oneself. 

twiddle

verb
  • To wiggle, fidget or play with; to move around. 

  • To flip or switch two adjacent bits (binary digits). 

  • To play with anything; hence, to be busy about trifles. 

  • To be in an equivalence relation with. 

noun
  • A small decorative embellishment. 

  • A slight twist with the fingers. 

  • A wiggling movement. 

  • A tilde. 

  • A tiny bit 

  • A drawn line that is curvy or twisted. 

  • A small musical flourish. 

  • A tizzy 

How often have the words fiddle with and twiddle occurred in a corpus of books? (source: Google Ngram Viewer )