When a clock refuses to function, the cause is generally found to be dry and contaminated oil that has compacted within the bearings as well as gathering around many of the other working parts. This congealed mixture increases friction around and within the bearings, restricting the flow of power through the gearing causing the normally free moving motion to bind and seize. The only lasting solution is to fully dismantle the clock, remove the dried oil and clean the component parts to check and correct the wear that has occurred.
Where we find missing teeth, sheared mainsprings or worn escapements, many situations lead to manufacturing bespoke parts that are not available today.
Wherever possible, we try to preserve the character of the clock to capture its patina rather than over cleaning or polishing when it isn't necessary. The clock and its current condition will need careful consideration before agreeing to a course of action.
Leaving a clock running for years without proper service intervals or attention will result in severe wear to pivots.
Many Escapements operate with sliding contact. When oil dries and dirt accumulates, a grinding paste develops, left untreated it will carve a channel into the material.
Where the gears mesh together combined with dirt and oil, wear inevitably will follow.
dust can find its way in through gaps in the case carried by the air