B7100 - Repair propeller shaft joint

[riddle2]

Hi guys,

I have a problem with propeller shaft joint. It seems to be that there is a loose sealing--> See attached picture.

Can someone of you help me, how I can repair the joint?
The problem is that there is only very few space. I have even problems to reach the joint with my hands.

Is there a good procedure to handle this?

Thank you in advance.

Best Regards,
Tom