{HEAD ~ The compensating device} 2, wherein {TAIL ~ said sleeve} is provided with two symmetrical cams , and said support section is provided with two ball bearings that are arranged to roll respectively on said two symmetrical cams during rotational motion of said support section  
wherein
{ HEAD ~ The compensating device } 2 , wherein { TAIL ~ said sleeve } is provided with two symmetrical cams , and said support section is provided with two ball bearings that are arranged to roll respectively on said two symmetrical cams during rotational motion of said support section
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