Quartz Pendulum Movement quality check Everybody all over the world buy thing care price and quality so you maybe how to check pendulum quality. clock maker use handmade or like production line. it need so many step ,clock parts too. one simple pendulum not only need different step for production but also need step by step check quality . for pendulum clock most for factory ,there are different type of they , they use different type:plastic ,copper ,acrylic etc.