A water-cooled internal combustion engine includes a water pump having a short pump drive shaft for reducing the weight and size thereof. The percussion drill further includes an internal hydraulic dampening system for reducing the velocity of the piston-hammer when the shank is forward of a power position relative to the velocity of the piston-hammer when the shank is in a power position. The patterned adhesive includes discontinuous deposits of adhesive that bond the label to the foam cup and form corresponding undulations in the front surface of the label.