Extreme precision is vital concerning the piston chambers. To ensure a uniform pressure build-up, which is crucial to obtain absolute control over the pivot door movement, the piston chambers and piston should be entirely in line with each other.
To give space to the immense force the system should be able to take, a maximum diameter of the piston chamber is required. At the thinnest part, there is only 2 mm of material available. The drilling should be consistent every time, so all drillings are measured on even the smallest tolerance. In solely this single part of the process, the hinge is checked on more than 60 points, including measurements, hardness, and even the tiniest dents. This will ultimately affect the behavior of the door, making it entirely predictable.
With a high precision quality check of the piston chambers with techniques that are also used for medical equipment like implants, the precision of the drilling and the pistons are tested and confirmed.