also hey ukeman, as I said in pm I didn't measure my cut and have no way to measure after the fact but here is a good shot of it, basically it needs to be just shy of flush with the top of the 510 threads, again this isn't a very critical dimension and close to this would be close enough, idea is when the o ring is compressed the atty will sit flush to the reo body and this will allow any larger atty's to sit flush to the reo. this will allow you to use almost any dripping atty modified for bottom feed
