The compensating device 2, wherein 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 {HEAD ~ rotational motion} of {TAIL ~ said support section}  
of
The compensating device 2 , wherein 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 { HEAD ~ rotational motion } of { TAIL ~ said support section }
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