DF64 grinder retention and grinding chamber dead spots after 1 Month of use (SSP MP burrs installed)

In this video I am opening my DF64 for cleaning after 1 Month of daily use. You can see some ground coffee deposits inside. O-ring did its job well though!

[@StefanoCipo87]

hello, I've been using the DF64 v4 for a week for espresso and after opening it up I saw a huge amount of retention not only on the exit chute but also around the burr chamber. It seems the upper burr carrier o-ring isn't working properly, indeed there is quite a bit of play between the carrier and the main chassis. Would you suggest replacing the o-ring with a thicker one? thanks