| 摘要 |
In combination, a guide post, a coaxial ball bearing cage adjustably receiving the guide post and adapted for longitudinal and rotary movements. A coaxial guide sleeve adjustably receives the cage and post. An apertured cap loosely received the cage and is mounted and retained upon the guide sleeve, and has an inlet adapted for connection to a pressurized air source. Pressurized air is directed from the source into the cap for impingement upon the cage for rotating the cage relative to the sleeve.
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