I run a second-hand store.
I sell second-hand second hands from clocks.
Where do I get all these second-hand second hands?
Well, of all the parts on a clock, the second hand moves.
It turns once a minute, as opposed to once hourly, or twice a day.
So, it comes loose easily. And falls off.
I walk through clock shops and pick them up off of the floor and stuff them into my pockets.
Then, I catalog them, clean them up, and put them on the shelves of my store.
The really thin ones, I use to pick my teeth.