The stock afc ring drove me nuts with trying to line up the holes, always getting mixed up when taking off the cap and single/dual holes blah blah. If you have a Magma, you know what I mean. So I took a brass lock ring form a nemesis clone, sanded it down on a belt sander and drilled out two 3mm holes opposite each other. The ring has a little slop around the interior when sitting on the atty so I popped a couple o-rings underneath and above the airholes and they sit nicely in the threads that were on the lock ring. Best part is it stays put when I take the cap off to juice up. If I need less air flow i can jus rotate and close off part of the hole rather than try to line up the jumbled up mess of holes that came on the stock afc ring. Also it sits flush and looks sick paired up with the brass on the Terra mod.