so, i drilled one of the holes only out to about 1/32" i would say the hole size is, approximately twice the size it was. its a v1 without the removable drip tip, so this gives a little extra draw for me. vaping the vapor company watermelon crush and nettmix honeydew in it on an ego 320mah battery and its giving me very nice clouds. just figured i'd pass this on to others!