I bought a riding lawnmower used, 17 years ago. The mower was very well maintained, engine was good, and already 25 to 30 years old when I bought it.

I wanted the manual.

Sears parts still existed, and they shipped me a complete copy of the manual(photocopied) for 10 bucks.

Manual listed all parts, breakdown, etc. I was able to confidently order parts, keep it running for a decade.

That was one reason Sears was so liked.

(for reference, my new mower manual has as much detail, I checked before I bought)