Drive shaft nut size

[exvolvoman]

Help needed please,
need to remove o/s drive shaft, 2004 W203 in order to replace outer gaiter
can someone tell me what size / type socket I need to remove driveshaft nut please?
30mm doesn't fit while 32 is too loose, don't want to risk damaging the nut
Many thanks

 

[exvolvoman]

Update, just found out I need 32mm 12 point socket, been trying to use hex socket which doesn't fit