I bought this grinder in summer of 2010 even after reading some of the negative reviews. I wish I had paid attention to the fact that there were so many negative reviews. I have just retired and am seriously getting into wood turning so I need the grinder to sharpen tools for my lathe work. I ignored the shaking for some time but comparing my grinder to the grinder at NWA's headquarters I found that I had to do something about the shake. I have bolted the unit to a cabinet and the shake is still so bad that tools fall out of the cabinet while running the motor. When I place a chisel on the arbor of the unit it makes a burring sound as if the arbor is not quite centered. I am finally going to take it in for repair on Monday. I would not recommend this unit. I will let you know how this repair goes.