795 sliding door bar issue

[gmni]

Hi, can anybody help me with this!!! Have a merry fisher 795, on the back sliding doors there is a bar which slides up and down to hold the door open and closed. There is a bar at the top and bottom of the door.
The bar at the top is connected to the door via two screws. One of my screws has come loose. The screws to reattach are inside the sealed unit. I have taken the unit off but can’t figure out how to get the casing off. Have tried taking the end caps off but they only move half a centimetre or so. Has anybody any ideas?

This has me baffled!!! Please help!!

  

[happyfisher]

Had the same problem with my 695 I found screwdriver in the end and the top comes off to reveal locking bar inside remove the bar and put locktite on screws and job done