The belt too has an angle according to the angle of the movable part, so when the movable part is pushed outwards, the belt adjusts itself, and the diameter of the belt in contact with the driver increases. So when this weight is expanding against the hub, it will start to come in contact with the movable half (part #7), pushing the movable half towards the engine. If you take a look at part #7 in the diagram (the movable part of the driver), it is not flat but rather has some angle to it. The spring will respond with an even higher force to resist this expansion. As the system starts to rotate, the weight will experience a centrifugal force in the direction opposite to the spring force, as the rpm increases the centrifugal force will also increase and pushes the weights in the outwards direction, and stretches the spring in the process.
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