The cuff retaining ring is further adapted to exert a substantially axially directed force directed against the annular cuff portion and first and second axially spaced {TAIL ~ walls} of {HEAD ~ the annular recess} whereby a controllable torque to rotate the cuff relative to the orifice ring is developed substantially due to friction between the first and second recess walls cuff portion and the annular recess 
The cuff retaining ring is further adapted to exert a substantially axially directed force directed against the annular cuff portion and first and second axially spaced { TAIL ~ walls } of { HEAD ~ the annular recess } whereby a controllable torque to rotate the cuff relative to the orifice ring is developed substantially due to friction between the first and second recess walls cuff portion and the annular recess
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