This set was fun to build. The timing is pretty accurate, I got about 5 minutes faster than 12 hours on the default configuration. The kit includes instructions on how to adjust the pendulum if it is too fast or too slow. Some recommendations/notes when purchasing this kit. I recommend buying extra paraffin as the amount that came in my kit wasn't enough. All gears grind and rub, I had ticker issues initially simply from not grinding the first gear enough. You will need a little over 2 pounds of loose material (sand/rocks) to weight the pendulum. On page 9, the instructions don't align the gears correctly, just rotate the smaller gears 90 degrees and you're done.
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