With the line stripper removed simply lift the winch drum of the base. You are looking up into the bottom of the winch drum here.
Inside the drum you'll find the bearing races, though one may be left behind on the winch base, or both. Reach in and slide the bearing races out or if one was left on the drum lift it off and set it aside for cleaning.
Under the top bearing race on this winch are two plastic washers/shims. Remove them but note the color and position they were in so they can be installed in the correct order when putting it all back together..