ZBrushCentral

Symmetry problem

Hello guys,
i have been working on this model for last 2 days now. then i lost on ear so i use mirror and weld to get the other ear. now problem is i cant get my pivot point in the center of the object. means somehow i think my object is little bit rotated due to which i cannot sculpt symmetrically. kindly help me resolve this issue so that my effort of last 2 days does not get lost thank alot guys
i am giving link to the zbrush file below

Looking forward to quick replies
thanks again :smiley: