I tried that tip VP Junkie with a small screw on ONE of the holes, and I got a 510 style draw as well. I also modded the top of mine to take a drip tip. I switched to a 4 ohm coil, which came out at 3.5 (first one off by more then .2) regardless using it at 5v and I'm in heaven. The drip tip fits nice and snug and it looks and works great.
Well I got this atty smoking out the room and bursting with flavor , as much as I prefer 901 this attys gives me the flavor plus vapor as a 901 with the draw of a true 510 very impressed