If you struggle adjusting the timing of your cuckoo clock because you cannot get precise movements of the bob, this is the thing for you. The shaft and pine cone bob are threaded (M10x1.5) and enable very precise fine-tuned adjustments.

It took a couple days of adjustments but my clock has run for a week now and has only drifted a few seconds.

Move the cone up the shaft to make the clock tick faster (if its running too slow), move the cone down the shaft to make the clock tick slower (if its running too fast).

Cone is a remix of: https://www.thingiverse.com/thing:1494252

No supports required. Infill will affect weight. At 20% infill I had to move the cone almost halfway up the shaft so you might want to print that at a lesser infill.