Ultra Simple Homemade Keychain

Carlos, of Carlitos’ Contraptions, has reduced the keychain to its smallest possible form. The end result is something that makes the minimalist Keyport look over-designed. The DIY project is as simple as it is elegant: The keys are riveted together with washer in between. No more jangle, nor awkward angle-of-dangle. The instructions are so sparse that we’ll reprint them here:
Materials
3 washers (number of keys +1)
Some keys (I use only two keys)
A rivet
Construction
1. Fasten the keys together using the washer between them.
2. Admire your creation

Brilliantly simple - love it! I should really put my keys on something like this instead of the huge contraption I use now. But where would I attach my portable hand sanitizer bottle? :-)