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You can buy servo-motors from any RC hobby store: I have priced them at several pplaces around town, and the cheapest was in Markham Village (16th and 48). They're also available from web-savy hobby stores.
Unmodified, they work as I wrote before - but Parallax, in the link above, wants to make them into two-directional, full-speed-until-the-control-signal-stops "motors", as used in model blimps and some helicopters (and EDUBots ?). If you have one of these, then coupling to a pot is required since the internal pot has been taken out of the loop.
In effect, you would be making a bigger servo. You'll probably want pulleys or gears to allow the motor to go someplace before the new pot reaches its limits. (With powerful motors, eg Drill Motors, Atwoods, the pot can be broken.
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