I can't adjust coarseness after reassembling the bottom burr

I can't adjust coarseness after reassembling the bottom burr

I removed the bottom burr of my capresso infinity for cleaning, and ever since reassembly it has been grinding coffee on only the finest setting, even when the dot is twisted to the coaresest setting. I suspect that whatever mechanism that adjusts the distance between the burrs is not working. What could I have reassembled incorrectly? I suspect it might be the ball bearings and springs - how are they meant to sit?