Did both drives have the same problems before you serviced the eject mechanism and lubricated everything? Is it possible you reassembled them incorrectly somehow?

You might try operating one of the problem drives externally, but not in a drive enclosure. Just a bare drive mechanism sitting on a table. Then you can visually see what's happening when you insert a floppy, and when the Mac tries to read it. Does the mechanism pull the floppy shutter open when you insert the disk? Does the disk actually spin? Can you see the head moving? Try the same experiment with your good drive, so you can have a visual reference for what it's supposed to look like.

If the drive is already non-functional, I wouldn't be shy about getting in there with whatever tools seem necessary and pushing or bending anything that appears stuck. The worst that can happen is it still won't work.