The mechanism itself is good! However, when I saw that it was "100% examinable" I got excited and
ordered it. Technically it is examinable, but you have to be pretty naive to not know that this is
some sort of trick cap...and when the spectator knows something fishy is going on but can't quite
pinpoint it, it ruins the whole effect. This just feels like something bought at a magic shop (which
it is, but the spectator shouldn't know that!!). You can still have fun with this, and if you're
really creative, maybe you can come up with a way to make it look as organic as a normal bottle cap
should look.