![Figure 6](/ServeContent?url=http%3A%2F%2Fdbm.sagepub.com%2Fcontent%2F2%2F1%2F894395%2FF6.medium.gif)
Figure 6
Dome-shaped type with a dome-shaped surface of the magnet and keeper and cushion type with a stress distributor.
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Dome-shaped type with a dome-shaped surface of the magnet and keeper and cushion type with a stress distributor.