My Parker 100

Greetings Amigos,
The nib of my Parker 100 hasn't properly aligned with
the shell.
Anybody knows How to alignment this modern pens ?
It looks like Parker 51, so, Should I unscrew the
shell to remove the nib assembly...or the nib section
can be pulled out from front section???
Comments and advices, Welcome
Thanks in advance,
Rene.