Overall I like this product and have used it quite a bit. I replaced a grinding wheel with a twisted wire wheel and found I had to find and use a spacer to properly clean the inner cover. fingers along the edge, as if when sharpening a chisel, the lower part of the stop would not interfere with my finger; In addition, the tool rest cannot be tilted to accommodate angled sharpening such as B. chisel record. The holes were easily marked for drilling and the mounting screw heads were much easier to access, I had to temporarily remove the base from the motor which added about 15 minutes to the installation time. Finally, I quickly realized that the clear plastic glasses must be of very poor quality, as the clean cloth left small scratches on the lens the first time they were wiped.