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The square aluminum metal retainer you mentioned is one electrode of the fine tuning capacitor. The round disk mounted in the tuner body is the other electrode. The phenolic disk is the dielectric. By turning fine tuning shaft you vary the amount of dielectric between the electrodes. According to Admiral, the fine tuning control varies between 3 and 5 pF. You will have to install the square aluminum metal retainer for the fine tuning to work.
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