The cuff retaining ring is further adapted to exert {HEAD ~ a substantially axially directed force} directed against {TAIL ~ 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 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 the annular recess 
directed against
The cuff retaining ring is further adapted to exert { HEAD ~ a substantially axially directed force } directed against { TAIL ~ 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 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 the annular recess
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