1st step is the CAM face has been selected

2nd tried to select the rod end (Exhaust Valve) which naturally would be a semi-spherical surface, however this is the result.

The question is what must I do to have the Exh, Valve end follow the surface of the lever action?

I am nearly there with this, next thing to do is have the spring compress - then I feel as if this can demonstrate the operation.