I have a problem and I can’t figure it out. I work in a clock shop and we buy pendulum swingers to imitate the movement on one from mechanical. The problem I’m having is that i tried different potentiometer from 10k to 150k and there all doing the same thing. I use the sweeper leg and another one on the positive lead. Is there something else I could do or use. I took electronics in school 20 years ago and forgot a lot. They use 2 c batteries in parallel. On narrower grandfather clocks the pendulum strikes the sides. If I turn potentiometer up it hits the sides. If I barely turn it down it stops. Any help would be a appreciated thank you.