tinkered

/T IH1 NG K ER0 D/
verb
  1. 1

    To fiddle with something in an attempt to fix, mend or improve it, especially in an experimental or unskilled manner.

  2. 2

    To work as a tinker.

  3. 3

    To tinker with; to tweak or attempt to fix.

Source: https://en.wiktionary.org/wiki/tinker, https://en.wiktionary.org/wiki/tinkered