Belt retractor

A noise reduction device (15) for use with a vehicle sensor (1) in a vehicle safety restraint retractor, the device comprising a part (21) arranged to be frictionally couplable to a retractor spool (51), an inhibitor arm (16) extending radially from the frictionally couplable part and a counterbalance (22) arranged on a counterbalance arm (17) extending radially from the frictionally couplable part (21) and circumferentially spaced from the inhibitor arm (16), the device being arranged such that on rewinding of seat belt webbing onto the spool the inhibitor arm is moved to a first position in which it inhibits the vehicle sensor, and on withdrawal of webbing from the spool, the inhibitor arm moves to a second position in which it does not inhibit the vehicle sensor, wherein the counterbalance is weighted and located so as to move the inhibitor arm to the second position if the frictional coupling between the device and the spool fails.