detachable keychain

(Version 2 will follow after testing is complete.
It will have a locking-mechanism, which should prevent the slapping when you havent strong magnets)

You need 2 magnets for this helpful little key ring.
I used round magnets with the following dimensions:
8mm in width and 3mm in height. 
If your magnet has a height of only 2mm, I have uploaded AddOn.
You can also use smaller magnets, but I found that these have the perfect strength for heavier things like a lamp.

Just glue the magnets in the holes. 
Have fun, please share me your experience.