Ninja Master Prep QB900B ...Where does the small spring attach?

Ninja Master Prep QB900B ...Where does the small spring attach?

Top button of Ninja Master Prep QB900B is stuck….big spring under it and seemed okay, springy, etc. However, when I opened the inside, there was a small spring that fell out. I have no idea where it is attached. I’ve attached a picture of it. I wonder if the small spring had something to do with the button being stuck.