Wait, they don't use real data? That's wild. Finleyh89 said the good ones do, so maybe you got a bad one. Sounds like a total scam if it's just guessing.

I used to just force a pinching cut and hope for the best, but a kickback last year that nearly took my thumb off changed my whole view. Your scrap board clamp trick is exactly the right move, it saves the piece and your fingers. I saw what happened to @henderson.wesley with the nails, and that's another good reason to just stop and reassess. Now my only go-to is to kill the power immediately and find a safer way to finish the cut.

Sounds like a lot of fuss over some old bricks, @ivan165.

Heard about using a water jet to break it up first?

Circular stones could still be for a villa's fancy garden feature.