Good idea. The guide needs a little help. For those who can use a small block like K.1060 it will work just fine. However, the manual control (knob) for speed selection is not as good as the foot controls. As I said, the concept is good, but I felt that the manual controls needed to be greatly improved to get the device working. The pedal control sets the device in motion immediately. The instructions should indicate that it is not necessary to disassemble the device to insert the bit. Simply turn the knob counter-clockwise. The wrench concept needs a lot of help. They are difficult to use. There must be a better way?