Re: [MBZ] 350SDL-noise up front-

[Peter Frederick]

There is rubber vulcanized between the clutch plate and the driveshaft. 
 However, if the pulley wobbles, it's probably the bearing the pulley 
rides on, not the clutch.  The rubber is there to soften the "clank" 
you get without it.  Standard Nippondenso, I believe they all have it.  
Usually lasts the life of the compressor unless the front seal goes bad 
and the resultant oil deposit softens it.

Peter