Cro55y I have tightened the bolt until the burrs just start to move . I have tightened the collar until I can turn it no further. I have also checked the 2 slots that feed the tunnel each time ( 😆 I have done this a number of times ) to ensure they are clear
Just making sure… But you say that you “have tightened the collar until I can turn it no further”. Say that’s at your “zero” mark. Did you open up the burrs to around 15 or so, so coffee can be ground? (I think you did, but just checking).
If not the above, did you put the sweeper the right way up? Did you put the burr assembly springs back?
edit: Looks like you did… Maybe a chute blockage then? Without watching you putting it back together, it will be a hard guess.
Also, did you put the disk the right way up? Does it grind without the disk?