Fetling or Fettling: How To spell?
The word Fetling is misspelled against Fettling, a noun meaning "A mixture of ore, cinders, etc., used to line the hearth of a puddling furnace."
Fettling has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings fe & ling which should not be misspelled with single 'T'
Wrong Spelling:  fe-t-ling  Correct Spelling:  fe-tt-ling 
Find more wrongly spelled words of Fettling to spell it well.