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:

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: