Anyone devise a way to get a good look at the rear main seal with just the pan off? This with a 727.

Tried a dentist's mirror, but not a good enough view.
Pan did have a spot near the back that didn't get a good seal with Hi-Tack.

I would really like to be sure!!

I know I can pull the main seal cap and do it again, but I worry about doing it upside-down on my back...Arrrgh

Thanks, Joe