Please forgive if this has been posted...
I made this "watch parts finder" by using double sided sticky tape to attach some neodymium magnets to a piece of wood.
Within minutes i had found a click spring that my wife and i had spent an hour searching for. I also found 2 screws, one recently lost and one lost a month ago. These parts were on the carpet (i know, not ideal for watchmaking). I had literally been on my hands and knees with a flashlight searching every inch of the area, and never found these until i used my new invention.
As the Army taught me many years ago... "the proper tool for the proper job."