a first biasing means operatively connected to said spindle for {HEAD ~ biasing} said measuring element in {TAIL ~ a direction} for projecting from said head and thereby for biasing the outer end of said measuring element to abut against the inner wall surface of a hole in a workpiece for measuring such hole 
a first biasing means operatively connected to said spindle for { HEAD ~ biasing } said measuring element in { TAIL ~ a direction } for projecting from said head and thereby for biasing the outer end of said measuring element to abut against the inner wall surface of a hole in a workpiece for measuring such hole
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