David,

I'm a little unsure how one can end up "left with 1 second stage between 
2 people" if there's a first stage that has two second stages...

Anyway, here's the way that I rig myself with a pony or second cylinder:

One first stage and one second stage on my main tank.  One first stage 
with two second stages on my secondary tank.  The philosophy goes 
something like this:

1) If my buddy runs out of air while I'm breathing my primary tank, the 
buddy can breathe from the secondary tank without a problem.  Situation:  
Each buddy has their own tank and a regulator, although I'm carrying both tanks.

2) If my buddy runs out of air while I'm breathing my secondary tank, the 
buddy gets the second 2nd stage and now we have both buddies breathing 
off the secondary tank, each buddy has a regulator.

3) If I run out of air while breathing my primary tank, I switch to 
secondary tank and end the dive.  (This situation should never happen!!!)

"My" regulator from the secondary tank is on a neck strap.  "Buddy's" 
regulator from the secondary tank is secured in plain view.

Note that this arrangement is for dealing with two independent air 
sources (not manifolded together).

        -- Kevin --
        kevink@ap*.co*

It is hard to disagree with a pro-survival decision,
     It is even harder to engage in prolonged arguments
          with someone who consistently makes anti-survival decisions.

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