It's almost too bad these have gone out of style; they are actually pretty elegant in a Rube Goldberg kind of way. An electric motor hidden below the fender turns nylon gears that eventually mesh with a toothed nylon rope matching the gears. That rope extends all the way through the hollow antenna sections and mounts to the tip. As the motor turns the gears, the rigid rope is pushed or pulled and the mast advances or retracts, stopping based on either a digital counter or timer or on a measured spike in voltage when the motor can't turn anymore.
As you might imagine, there are several ways these antennas malfunction. The most prevalent is a bent mast?even slight tweaks to the tight-fitting telescoping tubes can cause havoc. The nylon bits are a problem, too; teeth from the gears or rope break off from wear or cold or the rope snaps along the length. Sometimes the antenna fails when the components just plain get dirty?rain and dust infiltrate the mechanism, and things grind to a halt. Below we're going to walk through the general steps of removing the whole assembly, taking it apart, then cleaning and replacing the problem parts.
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