This sounds like an awesome technique. I have never read it any of my cannabis books.Yes sir.....eliminates jacking up a whole plant or bud if you are just looking to try a few seeds of a cross. I kind of discovered it by accident. I was pollinating a plant in the breeding tent which is close to the veg tent. Well as I was watering and trimming a veg girl, I noticed that the pre flower site was knocked up. So that got me thinking.....the pistil is there....the plant is sexually mature, lets try it as a controlled cross pollination technique and low and behold it works perfectly. On one big veg girl, I got about 40 seeds off. But takes a bit more work to hit all of them....unless you keep the male in the veg tent with them after he starts popping sacks. If you do that...just raise the boy over the tops of all your veg plants and give it a little tapperooo. That will generally find most of the preflowers.