wrote:
First of all, thank you for answering the question.

Secondly, the first answers were not serious because it was obvious from the
answers that they did understand the question, and chose not to answer it.
There were some pretty detailed answers but none gave at what reading would
one start considering the cylinder a problem.

You asked at what compression reading would you decide to overhaul the
engine. The answer is compression is just one factor. I had a cylinder
at one annual blow a 20/80. Doing an overhaul never entered my mind.
That cylinder turned out to be cracked. So you replace the cylinder and
move on. It's really only when your engine starts to make metal that
you contemplate overhaul. Although I had my engine make metal once,
turned out to be the shaft in my starter adapter. Replace the adapter
and the metal went away.