In article ,
Ignoramus20464 wrote:

http://www.youtube.com/watch?v=mPOSb_VhQq8

My variable speed drive, both pullies actually, wobble when they
operate. I shot a video of it at 5 Hz. It appears to be crooked or off
center. Might be some bushing missing or something. It could be that
the wobble in the primary pulley causes wobble in the driven pulley.

Anyone would have any idea?

Yes. My 5914 had a very bad wobble, which turned out to be due to the
bottom VS pulley assembly coming loose on the motor shaft and battering
itself. The root cause was a setscrew that had become loose, but
neglect by the prior owner or owners had allowed the problem to worsen.

The whole story is in "Clausing 5914 VariDrive Wobble" and children
posted to RCM in January 2008.

Joe Gwinn