With most clocks you will find that most clocks
are battery powered with quartz clock movements. Because of the
availability and work involved in repairing clock movements, many clockmakers
prefer to retrofit a quartz clock movement into old clocks to quickly and
inexpensively get the clock working again. Many of today's modern clocks
have inserts - they are complete from the front to the back including the hands,
crystal, dial, movement, and are assembled together as a complete replacement
and clock repair job.