A tape application system for sealing a carton. Additional signals are generated that equalize the frequency of occurrences of the transients, so that an effectively constant and non-data-dependent frequency is generated over the totality of the signals. The flexible wires are disposed via selective pressure of the surgeon and are variable in number. A method of detecting phase reversals in the set up signal is also disclosed. The sizing ratio of the door surface hole is different than the sizing ratio of the dispenser assembly cavity. Thus, the extension shank protects the control cord and the driving cord to prevent the control cord and the driving cord from being hooked or scratched by foreign objects, such as branches and the like, during operation of the blade unit.