Inside the back of the enclosure - several wires and a ribbon cable are connected between the floppy drives and the greaseweazle board.
https://files.bitbang.social/media_attachments/files/113/383/264/822/277/074/original/5c8f835a47f595d5.jpeg
Today I built up a Greaseweazle (https://github.com/keirf/greaseweazle) box with a HD 5.25"/3.5" combo drive and DD 5.25" drive so I can write just about any floppy that I care about. It takes 12V from a barrel jack and uses a little buck converter to get the 5V.
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