Hour hand is no longer held by the surrounding circle. It is held by the minute hand, and angle is controlled by the hung reduction gear which is kept vertical by the weight itself.
Print parts as precise as possible.
Remove debris and blobs around the parts carefully.
Adjust the balance of ***-hour.stl as shown above. You can attach M3 or M4 nuts as a counter weight.
Weld parts with soldering iron. Please make sure the smooth rotation with sufficiently small gaps.
In this case, silicone grease is not suitable because it is too viscous.
Same mechanism is seen in 1950’s clocks,