For the regulator, I don't use a tank o-ring... it is too strong.  I
believe, it is harder to break the o-ring by pushing away from the shoulder
than by pulling from the hip.

As Dave mentionned, a thinner o-ring is better (I just failed to use the
word preferable here ;-)

What I use is a o-ring similar (the same) to what we find on SL4 Underwater
Kinetics light.  The O-ring is thinner and can break more easilly if required.

Michel Therrien


At 12:47 PM 2/25/99 -0500, Jim Cobb wrote:
>Damn zip ties @#%$%!@#$%....  ;)
>
>Dave, this is cool technique, thanks for sharing it with us.
>
>   Jim
>
>Sender: David Shimell (shimell)  Date: 2/25/99 3:01 AM
>
>>All
>>
>>>>As I recall, JJ's method for securing the long hose second stage
>>>>involved a tank O-ring and a zip-tie. The tank O-ring is looped
>>>>round the hose in a "figure 8", and then zip-tied to the clip. This
>>>>gives it a little "stretch", while still allowing it to be broken
>>>>free with a good tug.  Is that what you are thinking of?
>>
>>Alternatively...
>>
>>Unscrew the pressure gauge from the first stage and fold an O-ring through
>>the eye of the swivel bolt snap.  In doing this you have created two loops
>>of O-ring.  Pass the pressure gauge hose through the two O-ring loops and
>>slide down to the end of the hose near the gauge.  Reconnect hose to first
>>stage.  Voila.  A breakaway without the use of a zip tie.  This should also
>>keep Jim Cobb happy as he rightly hates zip ties!
>>
>>BTW, the section of the O-ring needs to be appropriate to break with the
>>right amount of force, but not flimsy enough to break when not desired.  I
>>found a neck O-ring to be too strong and bought some thinner O-rings of
>>1/16" section but the same diameter (sorry, I can't recall the reference for
>>these).
>>
>>Note that this method can be used to secure break away regulator clips also.
>>
>>John Grogan put out an email a while ago about this, I am merely
>>plagiarising.
>>
>>David Shimell
>>Project Manager, Sequent Computer Systems Ltd., Sandton, South Africa.
>>Email: shimell@se*.co* <mailto:shimell@se*.co*> 
>>
>>-----Original Message-----
>>From:	John Brett [SMTP:John.Brett@pi*.co*]
>>Sent:	Thursday, February 25, 1999 9:36 AM
>>To:	techdiver@aquanaut.com
>>Subject:	RE: Break-away for pressure gauge?
>>
>>
>>
>>> There was something on the list a while back that JJ had devised a way to
>>> rig the pressure gauge bolt snap so it could be broken free if needed? 
>>
>>A guy I know has just come back from training with JJ:
>>>>Apparently, JJ was in a
>>>>situation where he couldn't get his gauge unclipped and couldn't cut it -
>>>>hence the switch
>>
>>>As I recall, JJ's method for securing the long hose second stage
>>>involved a tank O-ring and a zip-tie. The tank O-ring is looped
>>>round the hose in a "figure 8", and then zip-tied to the clip. This
>>>gives it a little "stretch", while still allowing it to be broken
>>>free with a good tug.  Is that what you are thinking of?
>>
>>The same applies to the SPG.
>>
>><snip>
>>
>>>The same method could certainly be used for the SPG, but I'm not sure
>>>it's necessary. Under what circumstances would you want an SPG to
>>>"break away"?
>>
>>There's a brief section in the DIR II tape where G talks about breakaway vs
>>non-breakaway
>>gear. The long hose and SPG come under the breakaway category as having the
>>boltsnap break off isn't a disaster (a pain, maybe), and there are cases in
>>which you
>>may need to get the hose quickly.
>>
>>John Brett
>>
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>
>
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