Hard constraint the solution

[HumbertHumbert7]

I have this problem: I have solved my differential equation and I have obtained the solution that is a displacement.
This displacement has a parabolic shape with zero at the boundaries 0 and 1 and a negative vertex that is 0.01.
I want that all the points of the solution that are below 0.005 come to have a value of 0.005. I have tried to use the apply_output_transfor but it doesn’t work. Can you explain me what to do?
Thanks