Go to Charlie Comics. Talk with nerd dressed up like Darth Vader (space nerd). Show him the broken radio, he can repair it, if you give him a soldering iron, some tin and a flat blade screwdriver.
You know that Charlie has got one, and he needs star screwdriver, so go near Randal's apartment and talk with Bob. Look at his tool belt. Bob says he has a toolbox in the van.
Close to the car and try to open the door - it's locked. Use laser with the lock and then magnet with the hole. Move the door.
Take a soldering iron and some tin from the toolbox. Take also a sponge. Don't forget about magnet.
Now talk with nerd dressed up like Jules Winnfield from Pulp Fiction (classy nerd). He has got a gun and needs silencer, so combine duck tape with the funnel. You'll get homemade silencer, give it to that guy.
Unfortunately, the shot scares Bob so much that he drops star screwdriver. Take it.