Mercury Floor Machines 1908 19 inch Harpoon Pad DriverMercury Floor Machines 1908 Genuine Mercury 19 inch Harpoon Pad Driver with Riser 92 Clutch Plate Brush is 2" smaller to fit the machine, title is for machine brush fits. The Harpoon Pad Driver has a double row, with Velcro style hooks that hold every type and thickness pad. The injection molded hook sheet is also bonded to the high density plastic block which is molded with a 1. 50 inch riser for extra height clearance. The Clutch Plate attaches