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 walls of {HEAD ~ the annular recess} whereby a controllable torque to rotate the cuff relative to {TAIL ~ 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 walls of { HEAD ~ the annular recess } whereby a controllable torque to rotate the cuff relative to { TAIL ~ 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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