By the way, I just looked at the thread you linked and it turns out that ADP's script does not actually do what I want. It simply multiplies all the x-deltas by -1, which no doubt can be very useful in special cases, but I was looking for something more general. No worries, though, the morph tool method works fine, and I know how to do it with an external program or script if I need to.

-- I'm not mad at you, just Westphalian.