| 摘要 |
A rotatable member, e.g. wheel (10), is cast, e.g. from aluminium, with a tapered central opening (18) into which are fitted a pair of bushes (21) e.g. of plastics, which have correspondingly tapered external surfaces and which define coaxial, cylindrical openings for receiving a shaft (15) and needle bearings (26). <IMAGE>
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