There edge trim has a little piece that juts down to sit against the side of the cabinet. My friend unintentionally put it on crooked & didn't care enough to fix it before we adhered the end trim. So it can't be moved now without breaking the end trim. My friend did scoot the cabinet up against the side of the filler piece though, but can't move it any further, so it will have to stay as-is. I don't know if he will want to put in filler strips to cover the seams of the cabinets at a later point. I don't think he's too worried about it though. We still need to get them all flush, level, & secured to each other.