Ok, this is an EXCELLENT trick! Unless you allow a spectator to see the trick several times and examine it freely for a long time, they're not going to know how it's done! So do it once... maybe twice, let them see it for just a minute and move on, and they'll be mystified! It really doesn't take much practice - just some standard misdirection, banter, and "memorizing" the trick yourself ahead of time - and you'll do great! I had the Chinese Rod Mystery, but this is MUCH better - in my opinion, as the spectator is in complete control of the "set-up".