ZSpheres Resym problem

[massivo]

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I have created this model with ZSpheres. Symmetry must be perfect:

http://www2.zbrushcentral.com/uploaded_from_zbc/200405/user_image-1085834095dvv.jpg

But there isn't... :td:

http://www2.zbrushcentral.com/uploaded_from_zbc/200405/user_image-1085834853pff.jpg

because when i create the model some spheres have been turned and im not been able to correct perfectly.
How can i correct the resym or made one model with zspheres and perfect symmetry?
Thanks!! :)