In its preferred embodiment, a pair of shoulders are formed on the sides of a circular disk like head portion and a pair of spaced apart surfaces are formed on {HEAD ~ the socket portion} which contact {TAIL ~ the shoulders} of the head portion when the phalangeal component is at maximum flexion 
contact
In its preferred embodiment , a pair of shoulders are formed on the sides of a circular disk like head portion and a pair of spaced apart surfaces are formed on { HEAD ~ the socket portion } which contact { TAIL ~ the shoulders } of the head portion when the phalangeal component is at maximum flexion
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