Well, there is a bearing above the rewind fork. Without removing the top MAYBE a minuscule drop of oil on that bearing.
There will be a difference in load when there's no film in the camera vs loaded which could result in the difference of torque needed.

Beyond that it will be as above, you can check that by loading a test roll and pull it out manually. It should be pretty free. If it's tight/gummed up
it will need a real service.

There's not much to the RW in a Leica. The knob connects to a shaft that goes to a spur gear. That engages another spur and shaft that goes to a fork