...what that thing does is stand the mower up on it's back wheels so ya can reach the undercarriage, blades and all. Then ya can work on it at your leisure.
...mostly we just cuts regular grass, but there is the occasional canno ball left over from the war of union aggression that turns up.
Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!