I too am having problems with a new "used" shredder I purchased recently. I had a Howse 6' shredder and it cut great, but it was a cheap one with thin steel and it rusted through in too many places to continue getting fixed and welded back together. I purchase a used Tractor Supply Co (TSC) brand shredder with taller sides than the Howse shredder. My problem with the TSC shredder is that on level ground, without digging trenches from the sides digging into the ground, the grass height is about 8" tall. I'd like it cut lower, such as 3" tall grass/weeds. Is there a way to safely lower the stump jumper disk so the blades get lowered, or are there blades made for this purpose that drop down lower to the ground than standard blades? I looked on the TSC web site and they only list 1 set of blades for a 6' shredder. I assume that's the same set that came with this used shredder I purchased.