11 springs just have to handle 0.7mm, that is about 0.065mm per spring.

The original 15mm wide springs may handle 0.3mm per spring, from what I have taken off they still should handle 0.2mm per spring.

As mentioned I probebly do not need to give much pre-tension what will let the spring on its strength.

By the way, do not het fooled by the thickness of 2 discs against each other: () , There where they touch each other it seems thick.