Originally Posted by
Retro Grouch
You have laced the flanges off by one hole relative to each other. If you would take all of the spokes out of one flange and relace them exactly the same way but one hole over, you'll be good.
That's correct and most likely is your problem. If you look at the hub-flange from the side and you start inserting heads-out spoke, you'll notice that the hole DOESN'T line up directly across from the holes on the opposite flange. Instead it lines up in between the holes. So if that spoke you're inserting is 1/2 hole to the right of the opposite hole, you want it to go into a hole to the right of that spoke on the rim as well. Same if the spoke you're lacing is 1/2 hole to the left of the opposite hole.