Actually, the 700MHz iMac G3's did come with 60GB HDs. And judging from the feel of the screws when I removed the bottom plastic casing, I'm guessing the machine hasn't been taken apart before.
As for disassembly, the slot-loaders are a bit easier to take apart than the Rev A-D tray loaders.
I tested the optical drive with the bottom casing removed, and it turns out the optical drive's insert-eject mechanism is weak. It actually ejects discs okay, but it only pushes them out about 1/4"-1/2" from the inner plastic slot. So when you put the bottom casing back on, the CD doesn't eject far enough to see or grasp it and remove it.
I'm going to see if cleaning the mechanism helps.
As for disassembly, the slot-loaders are a bit easier to take apart than the Rev A-D tray loaders.
I tested the optical drive with the bottom casing removed, and it turns out the optical drive's insert-eject mechanism is weak. It actually ejects discs okay, but it only pushes them out about 1/4"-1/2" from the inner plastic slot. So when you put the bottom casing back on, the CD doesn't eject far enough to see or grasp it and remove it.
I'm going to see if cleaning the mechanism helps.