This Mac 512K was much heavier than it should have been. You wouldn't believe what I found inside when I opened up the case!
Part 2: https://youtu.be/Y5MJF5BxmSk
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Macintosh 128K video:
https://www.youtube.com/watch?v=H9dxJ7uNXOA
DaveJustDave Retro Computer Channel: https://www.youtube.com/channel/UCaW9nHuEF9G72xLZahGuO5Q
Ebay listing for the eject gears: (also available in lower quantities)
https://www.ebay.com/itm/Set-of-4-x-Gear-for-Macintosh-512k-Vintage-Floppy-Drive-eject-Mac-Sony-Apple/263868282137
Fixing hard drive motor with a few drops of oil:
https://www.youtube.com/watch?v=-UJ0YE1a1Fs
HyperDrive Installation Manual:
http://macintoshgarden.org/sites/macintoshgarden.org/files/manuals/Dealer_Install_Manual.pdf
HyperDrive Drivers:
http://macintoshgarden.org/apps/gcc-hyperdrive-software-drivers
DREM MFM HD emulator:
https://www.drem.info/buy