I custom designed the machinery for this, and as a mechanical engineer you have my word that these switches are being broken in on precision machines, and not some silly "rock taped to a fan" device. This helps keep the stresses on the leaves to a minimum, as the pressing is no harsher than your fingers.
NOTE: Kailh switch pins are a little thicker, and do not play nicely with Mill-Max sockets. It is not recommended to use the two together, and returns for ruined switches from using Mill-Max with these are not accepted.
Sales on worked in switches are final, as this is a product with a service rendered upon it.