Thanks, Oare.
I definitely have the grainy version. And I am using an unmodified AV Famicom. I haven't given the drive a shot in a while. Maybe I'll fire it up again to re-test it and do more research.
So is there any way I can try to fix this as a noob at these things? Or is there any rock-solid seller that we know has done the repairs the correct way? You always see listings for drives that have new belts, but it's my understanding that the disk head is also an issue. I've checked out the videos on this on YT ... looks kind of daunting.
I guess I can just do $35 on the FDS Stick and see what happens. Cheap enough to give it a shot.
I did my fair share back in the day, with decent success. I also have the necessary tools to rewrite disks that may have been rendered improperly readable.
But here's the catch: I'm probably a bit rusty. And I live in Japan. And I'm abroad (in Europe) until the end of the month.
The good news is, I just happen to have repaired a unit a few days ago, and it's working flawlessly.
(Edit: forgot to add that I am not a seller. I'd be glad to help because I've done a decent bunch of units - but only if it's convenient and hassle-free for all parties.)
If you want to give it a shot yourself, here's a link to a fairly detailed guide I wrote a while back (when I had way too much free time on my hands).
http://www.famicomworld.com/forum/index.php?topic=10767.msg150064#msg150064
Don't forget to put some new grease on moving parts, and don't hesitate to shoot questions if you have any. Owning a Famicom without a working FDS leaves such a sad hole in its library!