I just recently got hold of a (barely, if any use at all) Sony MPF-920 floppy disk drive from a PC which I changed the drive ID of and had working perfectly in a Mega STe until I accidently got its read/write head knocked out of alignment (don't ask)
At first I couldn't read any floppies at all with it, but then I inserted a floppy, started formatting and slowly moved the head around until the "hickups" stopped and it started stepping from track to track. It now formats about 3/4 of a full DD disk (I haven't tried it with a HD disk yet) and wonder if there's a simple way to get it better aligned? Perhaps some Atari software for this very purpose?
I've heard about alignment disks, but they're hard to come by and to my knowledge they only run on PCs.
What I do have is another fully working Sony floppy drive for the Mega STe (could be used for writing some reference material which the mis-aligned drive could try to read?) and some tools which might come in handy (oscilloscope, digital multimeter). Is there anything I can do short of guessing where the head should be by trial and error? With the ability to move the head both left/right as well as forward/back there's bound to be a lot of combinations, and I assume the need for accuracy is quite high as well.