I havn't played with it. I would look for meteor videos. Look for a meteor weave tutorial and that should tell you. A meteor is (basicly) 2 poi glued together at the ends.
So, I should think the poi are held together at ends.
Try this
Do a standard 2 bt weave with 1 poi. Now do the same thing with 2 poi in 1 hand, but make the 2nd one shorter (pic one) and do the same 2bt weave again. Once you get comfortable doing it with 1 long and 1 short, increase the length of the short one a little at a time until it's like picture 2, doing the same 2 bt weave.
Once you have that, a corkscrew is basicly a weave on floor/ceiling plane. So now take said 2 bt weave, turn it 90° so it's on the floor and ciling plane and there you have the 1 handed corkscrew.
Hope this helps, best I can do with MSpaint.