You can get those fancy sockets that grip onto knackered hex heads. They might help.
To get more space to work on the screw head behind the shock remove the shock connection at the top (making sure you don't undo the internal parts of the shock by accident! This means hold a spanner on the flat whilst undoing the lock nut(s)) and lower the hub as far at it will go. If you are quick you should be able to get the top part of the shock out of the locating hole.
|