Which constraint do I use?

[MotoMiri]

Question to those who would care to answer:

 

I want to create a constraint where the resting position of the child is directly center of the cone with a spring motor to return to this position, like a limited hinge constraint, except with a cone. Is this possible?

 

I'm thinking bkdgenericconstraint is the only option for maintaining 3d elasticity without gravity deforming it, but that constraint doesn't look natural and I'd like to change it to something like a spring door stopper, with variable springiness.

 

*edit* Well, after several hours of xml tweaking, unless someone knows an xml setting that I don't know of I'm fairly certain I have to combine ragdoll and BKDgeneric, which I don't think is efficient in the least, but unless someone knows a trick I don't know and would like to share