This is a modernized version of the hidden blade from the assassin's creed series based off of concept art from the assassin's creed encyclopedia. This hidden blade is a dual action design and uses a very similar mechanism to what is used in the game and is easy to put together. Please note that kit does not include a blade but a blade for this kit can be found in my shop.
Other materials needed for this kit:
rubber bands (varying sizes) or springs,
a ring (optional),
and string of some kind