help…

a screw got lost and now my gear shifter thing is loose.

What do I do?

What is the specsof the screw to replace this ?

https://media.discordapp.net/attachments/758025834836787292/1239641329047441529/20240513_194027.jpg?ex=6643a974&is=664257f4&hm=e6d9aee9c362661220fa829fd3b384659dd53699b5c33a02a47a6fe67ac65c54&=&format=webp&width=1440&height=811