It has come to my attention during a recent disassembly of an 1880s French mantel clock that the majority of gear train binding issues attributed to pivot wear or oil degradation are actually the direct result of poorly tolerance-matched bushing replacements. When replacing worn brass bushings, most hobbyists ream the pivot holes to a static clearance of approximately 0.02mm, entirely ignoring the linear thermal expansion coefficient difference between the carbon steel arbors and the high-zinc replacement brass plate. If your workshop drops to 10 degrees Celsius in the winter and hits 30 degrees in the summer, that 20-degree variance alters the internal clearance of a 1.5mm pivot hole by a non-trivial margin. While that sounds negligible to someone accustomed to crude carpentry, in a high-count train with five successive wheels, the cumulative friction vector increases by an amount sufficient to drop the balance wheel amplitude or cause intermittent stoppages at three in the morning. I have compiled a spreadsheet detailing the exact reamer sizing parameters relative to ambient room temperature logs over a twelve-month period. I assume few people here measure their workshop relative humidity to two decimal places, but doing otherwise is essentially just guessing.