Manufacturer disclaimer: Dan_ed wrote earlier:
"The jewel cup (of the Talea) is slightly more difficult, but can be pressed in and out by hand, assuming one has strong fingers. In any case, it is pretty much a field replacement."
No, it is not: this is not something that should be attempted by the user! One needs a special tool in order to remove this part. This operation, if ever needed, should be done by the manufacturer.
Thank you.
Joel