.....got this really nifty attachment for my stick trimmer. It's round, has 3 blades sticking down and fits down over the top of cement sprinkler head protectors. Does a great job of cutting a round hole in the overgrown grass around the heads. Only problem is, it's worn out. Anyone seen one of these, or know where to get replacements? I put a post in the commercial section, but got little response. Anyone?