Supposedly you can't stop the growth until it's unnaturally large. But most people gain an inch out of the file at most. You also supposedly become insatiably horny with an inability to "finish yourself" with your hand. At least that's what I've read from other "testimonials," I'm not suggestable enough to have it have any affect on me.
I did this file for a while before I started writing Manhood Blessing, it permanently took away my ability to get pleasure from masturbating, the uncontrollable horniness and regular erections worked great, but size gain was minimal, not even half an inch.