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If you recall, I had some trouble with the stiffness of the gimbal's pitching action. Well, the stiffness did not go away with use, so I finally followed your suggestion of spreading some graphite powder (some HB pencil graphite to be exact) in the rotating parts. After a minute of working in the graphite and rotating the parts, the stiffness gradually went away, and the gimbal is now as it should have been from the beginning: it rotates very smoothly and with ease.
Edit: I should also mention that the tightening knob for the pitching action is now much more progressive: originally even a small twist would pretty much lock the movement completely, but now the knob has a much larger working range and the stiffness can be controlled with much more precision.
Thanks a lot for the excellent tip! Very much appreciated.