I finally got tired of having a movement, and not having it in action. However, a reasonable case is way to far away, so I put together a test rig. The rig consisted of some 2x4s, and a cedar top plate that allowed the cables for the weights to pass through. I picked up some lead shot (for making shot gun shells) for weight. The left two weights are 7.7 lb mason jars. The right weight is a 9.9 growler. The horizontal bar was required to keep the weights from interfering with the pendulum.
It actually took me more time than I care to admit to attach the pendulum (a 1x2) to the leader. Getting a rigid connection proved to be a challenge. The best solution ended up slotting the pendulum, and sliding it on the leader.
How it Works
It runs! It ticks! It tocks! When I put hands on it, they even move. I spun the minute hand a little bit and the hammers started firing. A quick beat count with a stop watch yields it is 14% fast. Adding a clamp to the bottom of the pendulum got it to within 4%. Not bad for no calibration.