Originally Posted by
Pompiere
Before I got the proper tools, I would leave the fixed cup in place and clean it the best I could from the opposite side. Now, I don't think twice about removing the fixed cup to do a proper overhaul.
Originally Posted by
merziac
This is the only correct answer.

I have the proper tools, but I still usually clean the cup in place, unless I have reason to think it is worn or damaged.