I still half of mine - the half that remained in the focus ring when the other part mysteriously broke off! I have no idea what happened, must have been when I put it into the camera bag.
The tightening knob for the hood also stripped under easy use about a year after I bought it. Not the best made lens I have, but I do like the pictures from it.
So if anyone finds a source for replacement levers, please post, I wouldn't mind having a new one.