When we received our first model (2008) the left front reel arm mounting bolts would loosen off . It got to a point that I lost a bolt and the hole was stripped out . Toro repaired it under warranty and it would still loosen off . The original mounting system would allow it to pivot causing the bolts to back off . After about 6 months the dealer called and said there was a kit available to correct this issue . Kit was fairly easy to put on and it has not loosened off again . I;m assuming the newer models have all the extra brackets .