Mainly, the second hand movement relies on the power of the steel clockwork to drive the gear to generate rotating force, and there is a balance wheel in it to adjust the swinging period (that is, the knob for adjusting the speed), and only swinging can drive the gear to rotate. With the force, other gears will have the corresponding number of teeth to reach the appropriate transmission ratio, such as1; 60:360 is an hour hand, a minute hand and a second hand.
It's hard to say.
It is suggested to disassemble a small alarm clock. Generally speaking, it won't be damaged and the price is not very expensive.