Kettensägekettenschärfgerät

Trying to remove the thuja tree trunk, mentioned in previous blips, I used a chain saw and the chains were all dull in a short time.
In order to spend less money on saw chains I bought a saw chain sharpener (that's what the long word in the title means). Today D and I gave it a try. Actually sharpening the saw chains is a piece of cake, doesn't take much time, but saves a lot of money.
PS: in real life the first part, "Ketten", is left out, so the word is a bit shorter; but I fancied the long version :)