When I 1st got my DID I thought it was too airy, but once I got used to it the draw started to feel to stiff. So i have been thinking of boring the air hole out to 1/16.for the last week or two. Mostly dreading messing it up as I don't have another top. Well tonight I decide to go for it. Wow was it simple. The drill bit went thru like butter and it was over in a sec.
Needless to say I'm lovin it. Lots more vapor and I don't notice any decrease in flavor or TH. To anyone thinking about doing it but worried of ruining your top cap, just do it, it's as easy as screwing the cap on.
I'm with you. However, I have two standard DID's and have one top cap like Jim sent and the other drilled to 1/16. Both are great for diff juices. It is a game changer for sure. Glad it worked out for you. It's amazing what the size of that air hole can do.