Found a good replacement candidate with better compression than my GOOD cylinders, which are well above minimum spec (even the 'bad' cylinder is still good, but not good for making power).
Also just checked out a little toy from the tool shack here at HP. Fiberoptic borescope with a built-in light and articulating end. It also comes with a 90° little mirror for looking straight up or down. With this, I'll be able to fully inspect the entire cylinder bore, piston, head, and valves from the inside.
Here'* a vid of the gizmo in action:
And some images from it. Focus is an effort when holding the borescope AND camera, but clarity is amazing using my eyes.
Precision ruler graduated in 10th'* and 100th'* of an inch: