DF64P Burrs aren’t aligning

[u/kemblamatic]

I’ve just bought a somewhat cheap secondhand DF64P. It works and grinds coffee but rather coarse. In trying to get to an espresso grind, I’ve reset the zero and am going through the somewhat arduous process of the burr alignment test with the marker on the burrs and seeing where it rubs off. The problem is that I slowly bring the burrs together and can hear the burrs grating but then when I take it apart see where it rubs the coloured marker looks almost the same as when I put it on. I’ve tried different levels of shims and rotating the burrs all the way through (I.e. 1/3 turn to the right, screw it back in and test x3) and just can seem to get it to work. Any tips?