Pass the pendulum through the slot in the oscillating arm at the back of the clock & hang the pendulum on the hanger several inches above the arm. Give it a bit of a wind-up by lifting the weight while pulling on a loose chain ang swing the pendulum. Make sure it has an even tisk /tock by tilting the movement or it will stop.
Or, go in an antique shop and look at one.
Good luck.
Vinnie
March 2007