Takagi Marco 2B Ultra Stage Movement Issue

If the stage assembly is not moving freely it may be due to the lock screw behind the stage rubbing on your bearings or maybe the bearings are making a groove in the shaft.
When you put it back together, make sure the lock nut on the bottom of the shaft is tight.
You can use a combination of a light grease (#17) and/or rem oil to lubricate the shaft.
The other video showing other procedures on the slit rod mechanism is listed at the end.