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, which is substantially greater than a radial force directed substantially inwardly by the cuff retaining ring against {HEAD ~ an annulus} of the recess located between the first and second walls, 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 {TAIL ~ 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 the annular recess , which is substantially greater than a radial force directed substantially inwardly by the cuff retaining ring against { HEAD ~ an annulus } of the recess located between the first and second walls , 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 { TAIL ~ the annular recess }
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