About this 3D model

I have bow and arrows, but they're quite old, and one problem is that the nocks keep breaking off (the nock is the part that clips onto the bowstring, I didn't know that until I googled it). I decided to design a piece that could fit over the broken arrows as a replacement, but it would be stronger. I made this, and it's specifically designed for the type of arrows I have, so I don't know how well it would work on other types. But If fits over the arrow and works great with the bow. Feel free to share or remix this design. Please share your thoughts or suggestions in the comments. :)