Originally Posted by The Golden Boy

I used the other threading- the derailleur bolt just has to hold the unit up. (notice my original post says "just about right") The coupler gets snugged up to the board bolt, then start the derailleur thread. Don't force it, yet be firm so the derailleur stays at the angle you want. The Duopar was a difficult case- I ended up just pounding in a nail to hold the derailleur level.