VPI Aries clicking sound...

I recently purchased a 4 year old used VPI Aries and I notice from the motor from about 2 feet away I hear a continous rapid click, click, click sound. Any ideas of what this is?

The nice thing is I just listen to a "reference" recording, which was recommended from my favorite audio blog and all I can say is WOW!!! The vinyl had a nice pin point image, a big sound stage and there was depth to the recording. I could hear the soloists in front of the rest of the orchestra.

I'm just getting back into vinyl and the last time I purchased a record was in the early 80's. So far I have no real complaints, just a little concerned about the clicking sound which I can not hear from the seated position.

Thanks in advance...