A restoration is much more than a refurbish or servicing. If a machine is in such good condition that it doesn't need repaired, rebuilt, parts replaces, it's original. Much better for the collector than a "restored" machine.
Needles, belts, should be original. Simanco needles and belts can be found, I have some. To make a machine 100% original it needs OEM parts. Any other state makes it a used, refurbished, repaired machine.