Hi Quakereject, I think what Scottbee means is that when you twist the center post on a cartomizer, you're twisting the coil loop (which may indeed tighten the center area and reduce the 'airyness', if you don't snap the coil wire like I did). This in turn can cause the coil wire (unseen) to touch the sides of the carto or in some other way cause a short circuit. And unless your battery has adequate short circuit protction (my Tornego doesn't), this can irreversably ruin the battery. This is what I got from what he's said in other posts.
Yes that's what I got out of it as well, since those statements are true.... I would also like to add the possibility that one would think that is adjusting the draw is what is happening when you actually twist that center post... let me explain
not only is one element end attached to the center post the element is covered by a "sock" which is the wick and a sort of "paper wrap"(best way to explain it) when manufactured everything is perfectly aligned so there is a clear path (where you can see straight
through from one end of the carto to the other) by twisting you may be causing that "sock to obstruct the path enough to make the draw to seem harder..... Now even though that is happening it DOES NOT mean that it is an adjustment (intended use of the cart) which is clear with your post and the other "nay sayers" (me included)
these comments are from experience and a lot of tinkering.
NOTE: I am not saying that it isn't a "trick" nor saying if one is doing it to stop... but at least one should know the principles behind it..... I would also not offer that up so freely as advice to do, as if that is its intended purpose.
Disclaimer: my experience is with the KR8 carto, and I am guessing by reading that the 510 carto is structured basicly the same way.