The restoration process is a highly labour intensive operation, and the technical work alone can take around twenty or so days depending on the make of piano and extent of work required.
With a full interior Steinway rebuild, nothing will be left untouched. This includes unstringing and removing the iron frame and removing the action, keys and damper system. In the case of action parts, depending on the age and extent of wear, replacement is often the best option.
To restore a Steinway correctly and thoroughly requires advanced knowledge and technical skills specific to Steinway pianos alone. One example of this is the action frame, which is comprised of three rails, which if split (not an uncommon problem) must be replaced and accurately positioned to ensure good regulation is possible.