jarmush, If you are talking about the bearing in the blender shaft assembly, it will be sealed/non greaseable for food safety reasons and new part is available to change. Below is a guide on how to change the blade/shaft assy., and a couple links to possible replacement part which you can also do a search for better pricing perhaps. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
[guide|51331]
https://www.cuisinart.com/parts/hand_blenders/csb-75/
http://www.ereplacementparts.com/cuisinart-csb75-smart-stick-hand-blender-parts-c-147322_147323_290058.html