Old "Rio" Mazzer Major burr question

Hey everyone!

I pulled this grinder out of the Sacred Equipment Graveyard at my work.  I had thought it was an old Super Jolly, but then as I started working on it I immediately noticed that's not the case-- the burrs are 83mm, which I think makes it a Major.  It's of the "Rio" vintage.

Anyways, my question is this: I had some new 83mm Mazzer burrs in stock.  After cleaning up the grinder and installing the new burrs, however, I notice that there is a significant gap between the burrs and the burr housing--for both the upper and lower assembly.  This was true with the old burrs too, causing a lot of gunk to be built up behind them.  Wondering if this is a burr/model discrepancy, if there is a missing gasket or other bit to fill that space, or what.

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