A method and apparatus for applying tension to a fabric decking on an article of furniture are described. The amplifier circuit includes an FET amplifier, a current sensing resistor that senses the quiescent drain current of the FET amplifier, and a switch coupled across the sensing resistor. An L-shaped bracket is provided having a first leg slidably mounted on the elongated shaft, pole or rail along its longitudinal axis and a second leg projecting perpendicularly from the first leg, the L-shaped bracket being sized to receive and support the rotohammer. The files may be converted to a format compatible with one or more electronic delivery methodologies, if necessary. The corner grips and flat sheet grips are preferably made of machine-washable foam with a rougher surface.