| 摘要 |
A footing structure including a plurality of recess holes at a bottom side of a hub, each recess hole having two springy retaining pieces at two opposite sides, and a plurality of metal receptacles respectively mounted in the recess holes and holding a respective magnetic element therein, each metal receptacle having two flanges extended from two opposite side notches thereof and respectively forced into engagement with the springy retaining pieces of the corresponding recess hole.
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