Problem with Mirror Modifier and allignement I was following the instruction of Blender Guru to realize a chair, I'm stuck in the part of mirroring, because the mirrored object apper to be in the wrong position  , in my case in the other part of the origin (look at the image, it's more clever) 
Maybe is something really simple, but I don't know what I'm missing.
I have alse tried to do what it's written there: Mirrored object is misaligned when compared to its source object
I was doing the operation in the wrong order, the right one is:

Add mirror modifier
Cut the part that you want to be mirrored in 2 half
Delete the vertices of one half

I swapped the first 2 steps