A detailed cost estimate is then made and forwarded to the owner of the watch for approval. If the repair is approved, the job is begun by completely taking the watch apart, screw by screw, wheel by wheel, and spring by spring. Every part is examined for damage and wear. Parts that cannot be repaired are replaced with factory originals. The watch is then reassembled and lubricated as it is assembled.
Most mechanical watches use a least five different lubricants for various parts of the mechanism.
After the watch is assembled it is tested for several days for operating efficiency. It is also brought to time and adjusted for position and isochronism if required. The watch case is cleaned and polished, the crystal replaced if needed, and the winding button changed as required. The watch is then placed in the case and test run for several more days to assure us that it is ready for return to the owner. Water resistant cases are further tested by subjecting the cases to various pressures and vacuums to be certain that the case neither leaks in water or leaks out air.