It seems like Vernet answered a question that no one asked. This is not one of their better ideas. I
use a LOT of Vernet equipment in my show. They make some great products that are good ideas, but
this is not one of them.
Think of combining a TT with a p_ll and you'll get the idea of
what's going on here. So, the TT is definitely not invisible, and you will need to wear a jacket to
make the trick work.
Just buy one of their quality Thumbtips and a video that shows how to
use it, and no one will ever see it.