fettler

/F EH1 T L ER0/
noun
  1. 1

    A person who maintains railway lines.

  2. 2

    Someone whose job is to sand and grind small imperfections from metal and ceramic castings.

  3. 3

    (by extension) Someone who fiddles or tinkers with things.

  4. 4

    A friend or mate

    โ€œHow's tha' doing fettler?โ€

  5. 5

    An ostler; one who looks after the horses in a mine.

Source: https://en.wiktionary.org/wiki/fettler