I would try making a hole with a heated pin or
something like that. Or
you might try punching a hole with a piece of small diameter hollow tubing
after sharpening the end of the tubing. Alternatively you might try
blacking out the clear spot with a magic marker or something like that.
That trick often works for reading damaged tapes (I recovered some 82176s
(for the 82161) that way), but the magic marker doesn't last. I think I
got about 10 passes before I had to go over it again.
-tony