WHAT IS THE ROUND MAGNETIC PIECE ON TOP UNDER THE ROUND COVER
A ROUND PLASTIC PIECE 1 &1/2 INCH ACROSS WITH A 14/16 INCH ROUND METAL MAGNETIZED PIECE FELL OUT FROM UNDER A FLAT ROUND PLASTIC PIECE. THE AREA IT CAME FROM IS ON THE TOP OUTSIDE OF DRIVE. PIECE FELL OUT AS I WAS TAKING IT OUT OF THE PACKAGE. WHAT IS ITS PURPOSE. THE ROUND MAGNETIZED PIECE HAS COUT OUTS ON IT
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