This lug gets in the way of the circuit board standoffs:
![Thus mounting lug prevents you from making the miniDSP stack](http://musicalita.com/files/2011/06/1108a-0017.jpg)
You need to remove it. It isn’t all that easy, I had to butcher it to get it out. With that done, though, you can use the PCB standoffs properly:
![With the lug removed, you can put the standoff in properly](http://musicalita.com/files/2011/06/1108a-0024.jpg)
This lug gets in the way of the circuit board standoffs:
You need to remove it. It isn’t all that easy, I had to butcher it to get it out. With that done, though, you can use the PCB standoffs properly: