I have done these with some success you have the basic idea. Some things to keep in mind.
1 Use solid lined color tubing or clear on outside only. Clear on the inside of your tube will end up with a clear void in the middle of your reversal.
2 wig wag your tube and blow bubble and yes now blow hole 90 degrees off original hole placement effects the final look of milli. attach a new tube to hole. Now the tricky part this tube needs to be big enough to blow out and shrink your reversal into it just like doing a tube implosion.
3 Shrink this down marver condense attach a handle to the bottom of your implosion using clear. Tear off the extra bubble, now cover outside with color or clear and attach handle to the top of your implosion. Build up a good heat base shrink down marver condense some more the more you can shrink down the better.
4 last step build up a good heat base and pull to desired diameter.
This tech is difficult to master but well worth the effort to learn. It is not limited to wig wags or reversals checkout this link.
http://www.talkglass.com/forum/showt...e-milli-tricks
Good luck T. S.