(Metal) New L/R String Launcher not holding Beyblade. Fix?

Hey, all. I ordered a Takara Gravity Perseus for the L/R String Launcher. Unfortunately, neither side locks the Beyblade in place — they just fall off. I have a L String Launcher and that works fine, so I’m not sure what the issue is. I twist until there’s tension, but it won’t grip at all. Ideas?