Update:
I can now report that the "bumper fix" was a success. After opening
the drive, it took a while before I realized that the sticky bumpers
are *inside* the head assembly. Also, when I moved the head with my
fingers, there was very little resistance, almost unnoticeable. I was
afraid that there was something else wrong with the drive. But I cut a
piece of post-it paper and put it in between the bumper and the head
part.
Sure enough, when I next powered up the drive, the head moved (before
it hadn't moved when powered up).
Put the top cover on, reassembled the drive and put it back into the
machine. Started it up, and it booted straight into Sintran (SINTRAN
III - VSX / 500 K to be precise). Yes!
Thanks for all the advice and encouragement. Much, much appreciated.
--
Regards,
Torfinn Ingolfsen
Now caretaker / owner of *two* working ND machines