This is the pic from this months HighTimes, if you notice the FIMMing pic on the bottom, it looks like they cut the stem, its not, its just the angle of the pic, I'll point this out in another photo.
This is from another source. This is the very top of the plant and the newest growth, this is where you'll be making the cut, you'll want to cut off 80% of the newest growth. Also, remember I said I'd point out in another photo that it's really not the stem they cut in that first pic from HT's if you take your thumb, and from the top of new growth downward, cover about 80%, now look at what the photo looks like just bellow your thumb, it should look a lot like what you see in the HT photo.
Making the cut, leaving about 20% of the newest growth, it'll just be a little piece of the leaf left.
View from the top after the new growth, notice the 4 cola's, there would have been just 2..also with this type of FIMMing, I understand that other parts of the pant will start bushing out as if you had FIMed them also, at least this is what I understand my friend to be telling me.
Nice graphic showing the difference in cuts, Topping and FIMMing
This is a type of FIMMing that Vamp talk about, looks hard, you hollow out the stem somewhat...steady hands anyone? I hope some of you find this useful, I know it helped me when I found it.