the bottom part of the collapsible Katana has a tendency to break, this is supposed to fix that and spice up the look of your katana. I recommend to print at infill 40% and above and if you have not printed the katana, do it without the logo as the knob does not fit. Here is a link to the one I made that has no logo.

https://www.printables.com/model/242898-collapsing-katana-no-logo

If it does have the logo than it would have likely come off already if you are considering downloading this model, the knob by it self should handle the pressure just fine.