Help: JP100D Trem bar doesn't stay in?

Do you have to tighten the JP100D Whammy Bar to get it to stay in place? Just bought mine used and it didn’t come with the whammy bar or tools. I ordered the replacement bar but it just drops in the hole and doesn’t pop-in or screw in that I can tell. Goofy question I know, but Im used to the Fender Strat style that threads in and I didn’t get the tool with my guitar. Just trying to figure out how it works. Any help is appreciated. Thanks!