@zaxar : Thank you but the ones in your link are not countersunk head (V shape with the larger part of the V on top of the head)

Standart M2.5 screw with countersunk torx head (T8 print size) are easy to find online but the head is somewhat too big for sitting in the frame hole of the knife.

Here is the screw i have on the knife : M2.5 with a smaller (diameter and high) head (hence the T6 print)

Still searching ;)