A dolly (200) comprising a chassis (210), a castor (220) having a fork (221) and a wheel (222) rotatably mounted to the fork (221) and a fastener (100) for fixing the fork (221) of the castor (220) to the chassis (210) of the dolly (200). The fastener (100) comprises a head (110) which is shaped to the peripheral shape of the wheel (222) of the castor (220).
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