I've never seen any rebuilder use non/res/non coil in this style head, nor are the originals from Kanger built that way (at least none I have seen). I have been considering doing this myself though. I have found the coils in these units to not really be made with extreme care... to put it the best way I can. I do go through and straighten out the mess that's in there as well as remove the absolutely huge "flavor wick" that's in there as it causes dry vape even with pure pg liquid for me. No leaks yet.