The last group of improvements concern measures taken to reduce the amount of touchup and repair needed after production:
Protective shields during installation of plate screws and bolts
Problem: Plates can get scratched during screw and bolt installation. Plates are difficult to touch up well.
Solution: Protective plate shields made of polystyrene were developed to fit each model. No touchup is required afterward.
Protective "armor" for cases during production
Problem: During stringing and other production work, the case arms, stretcher, and keybed would get scratched and dented, and would have to be touched up at the end of production. Often, the touchup was noticeable as such.
Solution: Plastic "armor," developed to fit the front end of each instrument, is kept in place during the manufacturing process to minimize scratches and dents. The result is that little or no touchup is required.
Plate protection around tuning pins during stringing
Problem: The area around the tuning pins can get scratched easily during stringing, and is difficult or impossible to touch up.
Solution: Protective plate shields made of thin sheets of rubber were developed to fit each model. No touchup is required afterward.
Plastic covers to keep strings clean during production
Problem: Dirt and dust would get into the bass-string windings during production, sometimes resulting in discoloration and tonal impairment.
Solution: To keep dirt and dust out, the pianos are covered with plastic sheeting when not being worked on.
Positive-pressure clean room for soundboard finishing
Problem: Despite best efforts to keep out dust, invariably it would get into the soundboard varnish as it dried, making for a less-than-perfect finish.
Solution: Create a positive-pressure clean room in which to spray and cure the soundboard varnish, resulting in a near-perfect finish.