Since a while my racing bike seems to have delopped a little crackling noise in my headset. I thought servicing the headset bearings might be a logical first step. Unfortunately, when I opend it up I don't seem to be able to access the bearing themselves. It seems like it is a zero stack headset with loose bearings, but I cannot remove the upper race, even with some force since it seems covered by some washer:
I've tried googling a bit and it seems a bit similar to the bearing described in this post. However, I don't see an easily removable circlip in my situation.
Does anyone have any idea how I would be able to remove this race to access and service the bearings? Many thanks in advance!