you need this tool
https://www.agatools.com/tool/porsche-transmission-tools?gclid=CjwKCAjwyrvaBRACEiwAcyuzREsNte7-2NZd21nr9aCaw3-NBwwm-_VqT1E_NaOsFoHlB-a-czUxkRoCl9EQAvD_BwE
or a shop press using a tube in the correct diameter.
there is a DIY on the pelican website.
i never used the tool above (yet) but i have it, and you can borrow it if you want.