Deciding Factor for Cutter

As you can tell by my posts I am trying to throw a cutter. What disappoints me is that I showed my friend the exact same way that I throw my cutter and his broke like a broken record. The only difference that I know is that he throws 2-3 MPH faster. Could that be the deciding factor?

Just wondering…how do you throw yours? I’d love to learn how to throw one.

Here is the way I showed my friend, the standard version.

http://www.thecompletepitcher.com/how_to_throw_cutter.htm

Here is how Mariano Rivera throws his:

The video explains everything.

his form, release point, arm pronation, etc could all change it.