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If you look at Ebay item 14187046432 you can see a traditional 10mm double pedistal clockmaker lathe. This size catigory is also known as an instrument lathe which I view as the next step up in size from the watchmaker lathe. While instrument lathes offer extreme precision, they are expensive and are more precise than necessary for clock work. Derbyshire Lathes use Bardon ball bearings and have a spindle runout measured in millionths of an inch . The cost of the bearings alone in a Derbyshire headstock excede the cost of a Sherline or Taig lathe. A Taig lathe costs much less than a Levin or Derbyshire but is more than adaquate to make clock parts.