a measuring element slidably supported on said head for axial movement in the radial direction of said spindle, said measuring element engaging said spindle for mutual axial movement, the bottom end of said spindle and {HEAD ~ the inner end} of {TAIL ~ said measuring element} having inclined surfaces at which said spindle engages said measuring element for converting an axial movement of said measuring element into an axial movement of said spindle 
a measuring element slidably supported on said head for axial movement in the radial direction of said spindle , said measuring element engaging said spindle for mutual axial movement , the bottom end of said spindle and { HEAD ~ the inner end } of { TAIL ~ said measuring element } having inclined surfaces at which said spindle engages said measuring element for converting an axial movement of said measuring element into an axial movement of said spindle
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