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 the annular recess whereby a controllable torque to rotate the cuff relative to the orifice ring is developed substantially due to {HEAD ~ friction} between the first and second recess walls cuff portion and {TAIL ~ the annular recess} 
between
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 the annular recess whereby a controllable torque to rotate the cuff relative to the orifice ring is developed substantially due to { HEAD ~ friction } between the first and second recess walls cuff portion and { TAIL ~ the annular recess }
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