Hand Attchment

Link to my partner:[email protected]
I supposed to create another design which our group comes up, but I changed my idea after I downloaded the stuff into the fusion. There is a long empty space among the side of attachment, so I wondered a design to use it.As the user push it from inside, the knife will be coming out, and he or she can use it to do anything, such as doing art, cutting food or even for defense. The force of friction and the design itself will make sure everything works correctly, but the force user pushed shouldn't be too big to break stuff.
Link to video: https://youtu.be/3y3WfPR6k6Y