Fix the three permanent rubber wedges with chloroprene rubber adhesive. After the adhesive has dried enough to hold the wedges in place, carefully remove the temporarily installed wedge. The following procedure applies to those Space Duel, Gravitar, and Black Widow games that used a Wells-Gardner display. Perform the preliminary procedure for all versions of the display, then refer to Table 3 to determine which version of the four displays was installed in your game and perform the additional procedure for that version. When soldering components to the display circuitry, apply just enough heat to provide a proper electrical connection.
Excessive heat can damage the semiconductor material.