gr1750 pressure roller

[paul printer]

turned on gr1750, had dificulty removing drum, the pressure roller is staying up.
i can manually push it down, but when i start new job after test run the roller stays aginst drum and wont go down.
paul printer

[Baphomet]

[paul printer]

thank you baphomet, much appreciated.
took off back, and found locking nut had actually come off, found it in bottom of machine.
machine is now going great.
thanks again.
paul printer