Ruler-Butterfly Knife

I remember when I was a kid, we often used stationery as makeshift weapons to play with.Now that I’ve grown up, I can’t help but reminisce about the happiness of those times.I want to create a series of designs combining stationery and weapons.The first one is a fusion of a butterfly knife and a ruler.I have more ideas coming, including a protractor that looks like a gun and a ruler resembling a katana.I think you can tell how childish I am, haha.If you have better ideas, feel free to share them—I’d love to make them a reality! For the clasp part, I used a soft mallet to gently tap it into place. After that, there's an important step: use something like needle-nose pliers to slightly separate the black components of the clasp above and below—just a tiny bit will do.The issue of it getting stuck or not fitting smoothly is mainly due to the three components being too close after the clasp is inserted. Simply separating them slightly—just a very small adjustment—should resolve the pro