[normdiaz]

That's actually a built in engineering tolerance. It's to allow for the continued proper operation of the bracelet after accumulating 10 years of wrist cheese (allowing for the non-WIS lowest common denominator).
Picture shamelessly lifted from the interweb.

Wow! That looks like some alien life-form growing in there. :undecided:

Glad I wasn't eating anything when I saw that.

 

[normdiaz]

One advantage of being hard-of-hearing -- rattling bracelets can't be heard. :wavetowel2: