| 摘要 |
A method for selecting replacement valve stems to replace corresponding defective valve stems including the steps of selecting a set of pattern valve stems representing the replacement stems and employing such pattern valve stems to construct a mold having coded cavities defining the contour of such pattern valve stems. Fluid plastic is then poured into the cavities of such mold while the mold is spun to force such plastic positively into such cavities under the influence of centrifugal force, the valve stem models formed in such cavities then cured and removed from the mold. The coded valve stem models are then collected together on a display board or the like to be displayed in a market area for viewing by customers so a customer desiring to replace a defective valve stem may compare such defective valve stem with the model valve stem to obtain a code designation to indicate the replacement valve stem corresponding with such defective valve stem.
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