Step 1: The Quarter Mod
The same basic results of this mod can be achieved by purchasing Grado 'bowl' pads, which have a hole in the center anyway and offer more of an around-ear fit. But that costs money. The point of these mods are to use what we have to make the Grados even better.
And on another note- Don't cut too large of a hole in the pad. Too large and there won't be enough cushion between your ear and can, and the headphone will be uncomfortable.
The steps are pretty simple. You will need:
3/4" socket or quarter (This is why its called the quarter mod)
1)Remove the pads from your headphone
2) Place the socket or quarter in the center of the back of the pad and press down hard
3) Cut around the circumference of the socket
And that's it....
Remove the circle you just cut from the pad and save it. It is going to be used later on for the dampening mod.
Now just reinstall the pad on your Grados and enjoy!