Potentiometer problem. Knob help?

I bought a potentiometer from Radio Shack. It's the smaller pot on the right. The only problem is it doesn't come with a knob like the bigger one does! How do I substitute a knob? A pencil won't fit. If I use a steel pin will I get shocked?

Buy a eyeglasses repair kit at a drug store. They come with little tiny screwdriver. Epoxy the tiny screwdriver on top of the radioshack pot with a drop of 3 minute epoxy or super glue. You have to hold it vertical while the glue dries.