Capresso Infinity Burr grind size is changing

[JoeM845]

I have a Capresso Infinity Burr Grinder (565 I think, metal housing) that has been giving gradually finer grinds over the years. I need to adjust the setting to a coarser grind every so often to keep the actual grind size the same. It is now set to the coarsest "medium" setting and giving very fine grind. I want a grind suitable for medium strong brew via a conical drip.

I have cleaned the grinder at the level described in the manual but have not disassembled it any further.

Can anyone offer suggestions about a remedy and things to watch out for if I need to do some disassembly?

Also, the picture in the online user guide shows a bean container with a conical shield over the burr housing. Mine never had that. Has the product been changed? Is it significant?

Thanks,

Joe M