An actuator comprises a drive input arranged to drive a shaft for rotation, a secondary drive train through which the drive input drives a first input to a comparator device, and a tie bar connected to the shaft whereby the shaft is connected to a second input to the comparator device, wherein in the event of a difference in the rotary positions of the first and second inputs, the comparator device applies a braking load to the first and second inputs of the comparator device.

 
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