I just bought a 1976 Zenith Wedge Stereo with Original Allegro speakers on EBAY. It's not mint but pretty close however the Turntable wheel won't move and the controls on the turntable "Stop," "Start," "Auto" seem stuck..Is there a locking machanism on these turntales that I am not aware of? I'm screwed the normal looking screws on top to thier proper positions..any guesses?

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