Determine the parameters for an optimal torsion spring for a door mechanism.

I have a door mechanism that requires a torsion spring to ensure that the door is always closed when the handle is not pulled out. I can give you a free hand drawing of the simple mechanism along with the dimensions I have for you to play around with. What I need is for you to calculate the optimal parameters (wire diameter, Inner Diameter, number of coils, angle of deflection, etc.) I you are a spring expert, do contact me and we can discuss more on this.