I am also experiencing this issue. I called Hustler last night and they told me to take it to a dealer and have them adjust the clutch anchor. For reasons similar to jcimob, that is inconvenient. I took a look at the clutch anchor and there does not appear to be any adjustment built into it, only 2 fixed mounting bolts.
I was also told it will not cause any damage as is. Not sure about that but it certainly sounds awful. I would think that metal parts hitting each other at high speed and frequency would cause something to wear.