If you already do have good girth- get a new condom (normal size) and cut off the tip to make it into a lubricated ring. Place ring as far towards the body as possible and then somehow (your choice) work yourself into arousal. Once you are “on the go,” start kegeling into the penis, and the more you kegel the more of a solid “lock” you will achieve. Then- hell, just keep kegeling until it feels like it wants to burst- rinse and repeat (and take a measurement while you are at full pump.) That measurement will encourage you to do it again and again until you achieve that size without the ring. Obsession, obsession.obsess.rinse and repeat.