Jay Honeck wrote:

Our Macauley prop was last overhauled (new blades) in 1991. It was
re-sealed and checked by a prop shop in 1997.

It has approximately 2400 hours on it. It's still in spec, doesn't
leak, works fine. Our A&P owned a prop shop in the 1990s, and is very
knowledgeable about these things -- but even he has no hard & fast rule
of thumb for replacement of a prop. He's very much a "condition" guy
(and it's apparently in good condition), but I'm getting nervous about
the age of this thing.

When the heck do you replace a prop?

When it's age makes you nervous.

Happy Flying!
Scott Skylane