.robb. wrote:Generally speaking, you want to only have the TT in play when needed.  When it is in play, you want to keep it pointed at the specs when specifically showing the hands empty and you want to keep the thumb behind the hand when it's down to your side or if you are gesturing while pattering.  Gesturing while pattering is a subtle convincer that you are not hiding something.  Your hands should mirror each other while gesturing.
Adding on to this- when used for the traditional handlings of the traditional tricks, the window of opportunity for the specs to see the TT is very small when you think about it.  Most of the classics work one of two ways:
1.) Paper switch or vanish: TT is rung in.  Paper item(s) provide cover for the TT as it's feature is utilized.  TT is palmed or put back on.  TT is ditched.
2.) Pour:  TT is rung in.  TT transferred to palm.  Item is poured.  TT put back on.  TT is either ditched or more commonly the steps are reversed to make the granules/liquid/whatever reappear.
The TT is in play for a very short period and most of that time is spent easily concealed.  
Not only that but the best ditch, IMO, is under so much misdirection that "it doesn't matter if you're dropping an elephant or a TT in your pocket at this point (Gary Darwin)."  Picture yourself performing with the TT.  The tricks* that you have performed have happened within your natural arms length and in front of your chest/shoulder area.  You're hands have been mirroring each other during your patter.  You're faced head on with your specs so you've developed a trust and familiarity with them via eye contact.  You've done the dirty work for the vanish- all you have to do is milk the reveal and make the ditch.  You now break their comfort zone. You turn to your right side- breaking the eye contact.  Your left hand goes up in the air, crossing your body, in a tossing motion- breaking the mirrored hands.  Your head follows the left hand motion to further sell the gesture.  It is vital that whatever your magic word or patter is at this point does not engage the specs directly.  You do not want to give them any reason whatsoever to be looking back at you.  You sure as hell don't want to use a question such as, "Did you see it go?"  If you do so, they will almost always instinctively look at you just to acknowledge that they heard the question.  The few that don't will look at you almost immediately anyway to either answer your question and wait for an explanation.  At this point, God and everybody should be looking where you are looking.  Ditch the TT to a pocket or wherever, so long as it's on the right side of your body.  Not only have you provided a mother load of misdirection, you have also set up a physical barrier using nothing more than the position of your body to protect your ditch from someone who didn't buy into your misdirection.  IMO, you should not bring your left hand and head back to the starting position until the ditch has been made.  Nor should you udder another line of patter.  It's usually best to not be the first to say something after the vanish.  Let the specs "Oooooh and Aaaahhhh!" and enjoy the moment.  When you reset your position, you want to move your head, left arm and rotate your body all in one smooth motion because you now want to work on getting that comfort zone back, assuming you're moving on to the next phase of a routine.  Pick up your patter where it left off and start the hand mirroring again.  If all went well, you've got them conditioned.  Use it to your advantage.
*I almost went down another bunny trail but will say that, like anything else, avoid over using the TT in a string of effects.  Not only that but avoid using it in conjunction with effects that may done with a TT even if you chose another method.
As bmat said above, do not challenge the specs.  It seems to be common sense advice that most only take at it's face value.  It goes deeper than that, especially in regards to patter.  bmat pointed out a common abuse and that is effects with a TT being presented more as a puzzle than an act of magic.  Another abuse is indirectly challenging specs by talking too fast and matching it with jerking movements.  This gives the vibe of a hustle or scam taking place.  The majority of the time, you are one ahead when using the TT.  Once the dirty work (minus the ditch) is done, milk the performance aspect for all that it's worth.  When the revelation is made... let it happen!  LET THE MAGIC HAPPEN!
Argh, that's such a pet peeve of mine.  So many magicians don't give each piece of magic their due impact, especially in a multi-phase/reveal trick.  Copperfield's Grandpa's Aces is a great example of doing it right.  Once you see that the first Ace has vanished from it's packet, everyone and their cat knows that is what is going to happen to the rest of the packets.  Yet each vanish is given it's own moment.  Then comes the revelation of the Aces.  Again, once the first is flipped over then you know what's coming next yet anticipation actually builds to the 3rd and final Ace being slowly turned over.  Anyway, rant for another thread.