The (fairly new) Deore hub was feeling a bit rough so dismantled and found the ball bearings in the non-drive side are in a holder like this:
I cleaned everything & races all look fine, so greased and reassembled. Adjusted carefully but there is still slight grinding.
Next step would be to order replacement ball bearings. My question is do I need to use the bearing holder or can I just use the balls "loose"?