To ensure the perfect closure of the cap, and a precise line-up of the different parts, an unusual and advanced bayonet system has been created, made possible by using a stainless steel micro-sphere, which is inserted in the cap within an elastic ring system which allows its breathing while the ball runs along the mill-made groove on the steel nib grip up to the point where it secures the cap with a soft click. Absolute precision is guaranteed by the use of multi axes machines to shape the smallest details of this complicated though smooth pen.
A second bayonet closure with a micro-sphere, again innovative in the high end writing instruments world, is set in the body of the pen to block the nib grip and secure the converter.
The Bugatti Type A is a technological-productive virtuosity.
The "writing engine", the feeder and the nib, is qualitative y superior. In particula , the nib is in rhodium covered 18 kt gold, and it is equipped with an iridium tip which guarantees a smooth writing.