Questions about pendulum's?

Erm, how can you 'know how to make them' but have 'no idea what theyre about'???? Cleanse it. Hold it between your 1st finger and thumb (or whatevers comfortable) and ask it show me yes & show me no and watch it's movemements. then ask it yes/no questions. Be relaxed and focused. There are many ways to use pendulums, and many different kinds of pendulums, you can mesage me if you want. Good luck