Thanks for the reply.

You know had the same idea about the balancer rotating on the hub. Went to a bone yard today to compare my damper with others. Out of three dampers my damper matches each of them in respect to degree numbers and screw holes. So unless all have slipped the same amount, mine is OK.

Have not taken off the balancer as yet. According to the manual and othe posts it too has reference studs, to the left and right. There are 4 washers between the bolt and balancer which cover the hole, so I can't see if has knocked off the studs or not.

Thanks again.