Mounting doubles to transpac

[scubaalblake]

I have a transpac + Rec wing.
Just bought a used set of manifolded 2x12l steel tanks.
With other twins I have used the 'twin fitting' kit (ie the plates) to fit to transpac because the bands dip in between the tanks behind the divers spine.

On this set the bands have an extra bar across the back which means the plates wont fit. In fact that additional bar curves slightly out towards the divers spine.
Are the bands required? Do I need them if this bar is in place? How should I mount the transpac. I was thinking of just using stainless bolts and wingnuts through the eyelets in the harness?

I am attaching a picture of the twins so you can see what I mean.

Thanks
Al Blake
Australia

 

[DA Aquamaster]

The bands pictured were made for use with the old stye "hardpacks" that could accommodate a single tank, or with bands with the curved section (to imitate a single tank) a set of doubles.

The cheapest solution is to put the bands on backwards so the rounded section is on the back side of the tanks. When reversed, you have essentially the same set up as with a more modern set of bands.

You will however need a longer set of tank bolts as one bolt will both hold the bands together and mount the tanks to the transpac. The order will be bolt head, washer, back side of band, front side of band, washer and nut. This will keep the bands tight and another washer and wingnut is then used to secure the tanks to a plate.

It is best to do it with the tanks empty but you can do it with the tanks full if you are very careful, change only one band at a time and kep them both parrallel and supported while you change them as you want to ensure you do not stress the isolator while turning each band around.

And if it were me, I'd lose the tank handles - they just create an entanglement hazard.

 

[scubaalblake]

thanks - that makes a lot of sense. Never thought of that curve mimicking a 'single' - but now you mention it.......and good point about the handles.....I'll ditch 'em.

Al.