The back of the metal frame of the floppy drive with two metal prongs with screw holes sticking out.
https://assets.chaos.social/media_attachments/files/112/469/290/227/886/309/original/05d45528e1309eed.jpeg
Another interesting difference compared to the 8050 with Micropolis drives is this weird contraption at the back of unit 0. It is there to support the drive PCB! On Micropolis drives the PCB is simply mounted on top of the mechanism. But the MPI mechanisms only allow for a half length PCB! So the Commodore built PCB hangs over at the end and has to be supported!
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