Originally Posted by the youth
the rubber bungs are sort of shock dampers like the springs on a clutch plate, it will work without them but as you turn the air con on it will shock the compressor, you could keep the revs down as you switch it on to reduce the shock.
Steve
It won't make a difference anyway as varying temperatures will make the clutch cycle in and out and you could be at any RPM when it happens as it's dependant on gas pressure and the rate that the fans cool the refridgerant.
You can buy a new clutch kit for them which will have the dampers in it. You just remove that centre bolt and it will be reasonably obvious how it comes appart.