Hi Brian,

> Previous attempt was not successful. I was thinking maybe
> history was interfering with the mirrored curve, or maybe it
> needs to be updated before joining...?

I don't think that history should really come into play there - if you give some stuff to Join it won't try to replace the objects that you have given it or anything like that, at least as far as I can remember right now...


> The previous join attempt created duplicates of the three,
> non-mirrored curves...

Hmmm, I guess make sure to double check which curves are actually getting fed into the join factory?

- Michael