I've not found information on the Internet that explains how to get an even/uniform gear using gear proper tooth counts in a wooden clock design. It's really quite easy once you know the answer. Uniform gear wear is achieved by ensuring the tooth counts of the two gears meshing together are Relatively Prime (also called Coprime) to each other; this occurs when the Greatest Common Divisor (GCD) of each gear tooth count equals 1, e.g. GCD(16,25)=1

Any other result other than 1 will have a repeating pattern that does not allow every tooth to mesh with each other. E.g. a 15 tooth pinion meshing with a 25 tooth drive gear. GCD(15,25)=5 and so 15/5=3 and 25/5=5; this means that the same 3 pinion teeth will mesh with the same 5 drive gear teeth, they will not have uniform wear.