that the metal against metal contact that constantly takes place when gear teeth mesh is NOT a source of wear in watch and clock movements, then, quite bluntly, YOU do NOT know what you are talking about! I have personally cleaned watch movements that, literally, ground to a halt due to the increase in friction that resulted from a build up of this metallic grit between their gear's teeth and even collected this grit and viewed in under a 100X microsscope.
If you want the servicing of watch's you do for your customers to last as long as possible, put a little oil on those gear teeth.
technoguy
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