If you dont wanna use tinfoil to line something your options are really limited. Okay your mom might have one of these around. You know when you decorate cakes with frosting you have to use those metal tips? I would suggest finding one of these and then attach it to something.. like a pen mabye? With glue or something? Or like just put your rubber stopper on the cake deal and use it just like that. Other than this option I'm all out of ideas. I assume that your male stem is the broken part also, this wont work if your female part broke.