We varied only four parameters: "b2" which refers to the position of the centre of the contact surface of the rocker; "rf" which again is a geometrical dimension; "ss" spring stiffness; "sp" spring pre-load. We varied only four parameters, we again used a sequential unconstrained minimisation technique algorithm to solve the problem. Here is what we have obtained: the original system has got a flash temperature which is much over 150°C and the optimised system has a flash temperature which is much less than 120°C. No important comment can be made for the work of specific friction forces because we can see here the optimal system is far better with respect to the previous one.

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