For you 610 owners . Check the bolts where the brace bolts to the rear of the machine . Of the 5 machines that have been through my shop 3 have been welded or have cracks . the last one I was able to drill out to 9/16 and tighten up . One I had to remove the frame and weld in a new piece cut out of a rectangle 1/4 wall tube . check the bolts often if your working it hard .