These are bad to the bone once you figure out how to do them. Set up the "stops" so you can enjoy this dead-stop variation.
The main point is to pull the bar into your abs – just a shade above the bellybutton – by driving the elbows up. Don't pull the bar up with the arms – drive with your elbows.
As with any row, keep your back flat and tight and wear a belt. Watch the video, especially the last set in the drop set, and see how my body position is fixed and I'm just driving with my elbows.
Some of the stuff you need to do to get a bigger bench press doesn't involve actual bench pressing. Check out the tips and get the training program here.