First unit arrived and the table corner bracket molding was broken and instead of just sending a replacement part a brand new unit had to be sent. Two problems were encountered when assembling the second unit: (1) The key on the motor shaft was too large to accommodate the aluminum grinding wheel and was not seated properly in the shaft. It seems that when installing the key it was hit / hit with a hammer. (2) The set screw on the grinding wheel is off center and would not align properly with the wrench if it could fit on the shaft.