SD:

The shift and control pressure shaft seals are installed from the outside, and hence, are removed from the outside. With a bit of cleverness, sharp tools, and excessive force the seals can be collapsed, bent, broken, and pried from the bores. Make sure you have the replacements in hand first.

(Unnecessary and self-serving note):
There ain't no such thing as a "Bowden Rod". The term Bowden is a proper name, and refers to the person and the subsequent company of the same name which invented and produced an enclosed cable of that name.
The rod in question is a "control pressure rod".