This is a great trick and better than the pen through note - just need to ensure the quality of the
blade so that the gimmick is exactly straight with the master key otherwise it can be noticed on the
set of keys deliberately put in view casually. Need to be far enough away so that the spectator does
not reach out to touch the blade too! Getting the gimmick to connect with the key at the moment of
''penetration'' needs a lot of practice - I missed once and messed up the performance. Lastly, the
last stage of freeing the key from the note is supposed to make a natural tearing noise but I don't
hear it well even if I swipe the key off the note - I have to make the sound up myself which is a
shame.