[Barnsworth]

Now in my opinion it shouldn't have that little "jerky" part. It should move smoothly into the belt whereas it looks like it's almost catching if that makes any sense to you. Mine does that too when its first spinning up but yours looks like it's doing it in a couple spots.

I hope someone else chimes in on this too but I'm guessing it's the drive clutch. The only reason I haven't replaced mine is they're rather pricy.