Ok, no PTFE tape then. I noticed there is a small rubber ring there so it should keep it sealed.
I used a hair drier and got the hood out. Not that easy but not incredibly difficult. Now the collector , feed and breather tube appear to be more difficult. Here is the step so far.

opened.jpg

I've seen some videos, I don't want to risk the tube to break into the feed and I don't think there is need to go too crazy with cleaning (it was already in pretty good shape) . My goal is to get the pen to write a little better/get it aligned etc.