My dictionary doesn't think fettling is a word. It's wrong.
Gary spends quite a bit of time fettling. Our friends Geoff and Edna, who often indulge in a spot of fettling, tell me it's the present participle of the verb fettle. All three of them use it to describe sorting out, tidying up and tiddlying off.
Fettle is in my dictionary. It means condition or trim - as in 'he felt in fine fettle'. It can also be what you do to tidy metal castings or pieces of pottery before firing them.
Fettler is also in my dictionary. A fettler is a person who fettles. You'd think that'd make them really spruce wouldn't you? Apparently it's most commonly used for railway workers.
I can't say for certain this pot was ever fettled, but my Black Pearl chili growing in it is in fine fettle, don't you think?
Quite a bit of fettling of my stories is needed before I'm ready to submit them to magazines or enter them in competitions. I think it's worth the effort.