I had a simular problem witha brand new RB600. Oil will not help as the unit is sealed and the actuator has gone bad. Best to buy a replacement and change it. The exchange is a fairly easy task too.
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Is this a new arm? I have had two Rega arms(250&300) both were bought new. They both exhibited this "problem." Follow Bill k it's only a matter of time before the weight of the tonearm will follow gravity and perform perfectly. Just don't force the arm down, then over time the slow descent turns to a flat out free fall. I know, because this happened to a degree with my 300.