You are correct about this. I got a confirmed original conshelf VI that was never rebuilt and it only had the -006 o-ring in the spring block, with no backup ring. The spring block is also different from the later models in that I had trouble actually trying to fit a backup ring in it at all. My conshelf XI and XII have the later style spring block that the more modern conshelf regulators have. I believe that they feature some sort of design difference (height perhaps) to facilitate the backup ring addition.
Volcano Orfice regrind On a conshelf
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You are correct about this. I got a confirmed original conshelf VI that was never rebuilt and it only had the -006 o-ring in the spring block, with no backup ring. The spring block is also different from the later models in that I had trouble actually trying to fit a backup ring in it at all. My conshelf XI and XII have the later style spring block that the more modern conshelf regulators have. I believe that they feature some sort of design difference (height perhaps) to facilitate the backup ring addition.
The very early spring blocks were shorter. It was not intended for the back-up ring.
The second generation spring block was longer to allow for the back-up ring, but it still looked like a crown.
At some point, they reduced the O-ring capturing lip (increasing the hole opening) of the spring block to make it easier to install the back-up ring and the O-ring.
The latest spring blocks have a square head and are the longest with a large opening to install both the back-up ring and O-ring. The latest spring blocks can be retrofitted to all Conshelf and Royal Aqua Master. They are the easiest to service since removing and re-installing the O-ring can be easily done with minimal risk at scratching the sealing surfaces.
The second generation spring block was longer to allow for the back-up ring, but it still looked like a crown.
At some point, they reduced the O-ring capturing lip (increasing the hole opening) of the spring block to make it easier to install the back-up ring and the O-ring.
The latest spring blocks have a square head and are the longest with a large opening to install both the back-up ring and O-ring. The latest spring blocks can be retrofitted to all Conshelf and Royal Aqua Master. They are the easiest to service since removing and re-installing the O-ring can be easily done with minimal risk at scratching the sealing surfaces.
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