mirror modelling

i’m modeling a head and i’m using the mirrored linked object trick, so i can model just half of the head while the other half changes accordingly. howevere there’s a problem: the two halves are not joined together, so when i activate subsurf i have a horrible seam in the middle of my face. is there a way to solve this problem or i can only wait to finish the head and then duplicate the vertices, weld them, and then finish modeling the central part of the head?

This problem was here discussed before, search on the forum. Also look at my Mirror tool.

i searched the forum a lot! but i couldn’t find anything about the seam, just about the linked copy + mirror tip.

anyway thanks for the link, i’m going to read it now