How does Mariano throw his cutter?

I am curious since i really have heard so many different oppinions.
worst thing is my shoulder is hurt so i cant try pitching to try any out and im just litterally killing myself over this

I saw a video on the grip that mariano uses . he showed it directly. he held it like a 4 seamer and then shifted his fingers to the right seam and threw.

i believe mariano rivera throws his the same way roy halladay does, and the way i do. This is the grip.

the thrid post down it shows it.

He grips it off-center from a 4-seam fastball. Late movement and in the low 90’s.

that looks like the grip that i thought he used