I think the gimmick is honestly vert clever and it works very effectively- it also comes with 2
spares in case you lose the piece (it is small and can be easy to lose if you're not careful.
I think it's a very effective device and the tricks that he suggests work very well. I
couldn't give it 5 stars as the way you have to store the gimmick before the trick is very awkward
and it feels like it might dry out the pen.
Still, very good. Can't wait to see more.