FP1 x axis Table removal

Having started with an early FP1, change wheel model sort of on approval, but it was really worn out and needed too much work so I have moved to a lever feed model No. 35784.
Everything looks very good except the x axis is very stiff. I have checked the gib, cleaned the seat out, it is not bent and the screw and slot adjustment fit snugly. So the gib is not moving back and forth.
The x screw is still very stiff, even with the gib loose. The thrust bearings were ok, but filled with an oily grease so I am trying to extract the screw, prior to lifting the table off.
I have now unwound the screw and lifted the table off. Apart from the expected gunk wear seems minimal, most of the original scraping marks are still visible. I think some of the stiffness may be in the drive sleeve assembly as it is difficult to turn by hand, and no the drive is not engaged. What is the correct procedure for removing the collar so I can clean it out and does it have to be greased or is it oil lubricated. I would prefer not to remove the nut. The nut area is extruding more very stiff oily grease. Any suggestions.
cheers
Ian