KitchenAid grain mill adjustment?

I have a KitchenAid grain grinder attachment that seems like it's coming out of adjustment.  The finest I can grind is about cornmeal consistence which ain't very good.  I've taken it apart a few times and cleaned out any junk.  When I put it together and use my mechanical brain to assess it, I don't see any way to get it to grind finer.  On the finest setting it has about a millimeter of gap between the grinding surfaces.  I don't see any adjustment (other than the big obvious knob on the front I've already played with).  I can't really believe that the grinding disks are wore down that much since it hasn't gotten that much use (maybe 10 gallons of wheat has gone thru it in the last decade).  

I wondered if a donut shaped bushing might have gone missing but if so, it would be on the wrong side of the assembly (making it more open, not more snug) so I doubt that's it.  Here are pics of the inside, the first is with the sloppy grinding shaft pushed towards the mixer to make the gap tight/fine, second is pushing it the other way showing how sloppy it is (this is the grind I'm getting on the Fine setting) and the third is with the grind knob opened up to a coarse grind.

Any ideas?

We first ground our wheat in a grinder which we use to grind whole corn into scratch feed. Even on the finest setting and restricting the flow into the grinder, we got wheat flour which was smaller than corn meal size, but not the really fine flour we wanted. Regrinding did not seem to help much.

We bit the bullet and bought the Mock Mill 200. Pricey at about $400, but we love it. Sourdough bread most every day. Hope this helps.

Thanks John!  Today I found a "fiber washer" at the big box store that was a good thickness to shim between the adjustment knob and the grinding wheel.  I put that in there today and it closed up the gap enough to make decent flour.

It's a weird thing to have to do though so I still wish someone knew how to adjust these the correct way.

And have you tried YT university?  Or asked the customer service people?  Or a local small appliance repair company?

I tried youtube and only found videos of how to use it.  Haven't tried the other options because I hoped a permie out here already figured it out :)

And that may be absolutely true😊!
Good luck!

I have a very nice stand alone grain mill with an easy adjustment from coarse to fine.  I love it!

Mike -

Which model is this?  Is it the most current model (KGM), or is it one of the older Hobart models (GM or GM-A)?

I don't have one, but I've borrowed my sister's (current model KGM) to give it a test run, though I haven't disemboweled it.  My own grain mill is a Messerschmitt Jupiter/Family Grain Mill with the KitchenAid PTO adapter, but I'm shopping for something different.  Maybe the KA compatible MockMill, maybe a Retsel.  Or, perhaps even one of the older Hobart-made KA mills.

I did look at this video form KA:

but I really can't see any shim washers or similar which look like they could go AWOL.

However, if the adjustment knob hunk, with its burr, weren't fully seated into the main housing (for whatever reason) that could stand the runner burr off of the bed burr and result in too coarse of a grind.  Not saying that's what's happened in your case, though - it's just a thought.  No doubt you've checked that already...

Kevin