Provided are techniques for maintaining instant virtual copies. In one preferred form, the top wall is formed from a first portion having a generally oval shaped access opening closed by a generally oval shaped closure portion interconnected by a wet adhesive seal to the first portion. An inner wall of the padless via hole receives a seed layer of a conductive material. The present invention also permits real-time tuning of problem parameters by the experimenter. The base is fixed to an end of the housing and is opposite to the top panel. The cable can be pulled through a tunnel and through a piston of a ram.