I have no pictures, but I will do the best I can to explain it.
Set the rack up like you are going to do rack lockouts, but move the pins one notch lower than normal. For my rack this means another 3 inches of movement. Take a close grip, I use a thumb away from the smooth, but grip wherever is close for you.
I prefer to use an enormous amount of band tension for these. I use doubled green bands. Not choked and double looped, but doubled the same way you would do with the minibands. I prefer to put on a shirt and take a close grip for these. The shirt protects the pecs and shoulders while trying to break free from the pins.
I have worked up to 225 bar weight plus the band tension, but the band tension is far more than the bar weight. I prefer to do this one after speed bench, but did it sunday in the Asylum with doubled pink bands, and just used more bar weight.
The reason I like this one so much, is that the doubled greens really jump on you in a hurry, and require an incredible amount of effort to get locked out, even with just the bar, as the weight goes up, so does the difficulty.
Not everyone can use the doubled greens right off, of course, the band tension needs to be adjusted for your particular strength level, but anyone on the board could do at least a doubled miniband, and work up from there.
I recommend the shirt to help get off the pins without seperating your sternum from your pectoral muscles. I have done these without a shirt and felt like my pec was going to go shooting across the room on the first set. Threw on the shirt for a lark, and was able to bang out 5 reps without any pec pain.
This is my magic lockout builder. George Halbert does something similar with a ton of band tension and a 4 or 5 board press. These are similar, but start out with no eccentric movement. I think this teaches you to explode, and the heavy bands teaches you to push hard and fast throughout the movement.
But wear a shirt!!! I don't want to read about somebody blowing their pec or shoulder all to Hell becuase of my magic exercise. Hope this helps, and have fun.
B.