Thanks for all the replies so far. Even with the detailed instructions sent to me I have not been able to remove the ground glass as yet. But as one person pointed out this does not remove the graf-lok back. To remove that there are six screws which is what I really want to do. I need to remove the bellows entirely to get at the rear rails and find out why they are sitting higher than the rails on the front swing down panel. I can see they were forced up when the camera was closed improperly but I don't see why they remain too high.
I just got the ground glass off. No problem. But as I said I need to do a lot more dis assembly to get at where I need to look.