Hi, one of the first stages in my collection is a Hollis DC1, which I bought new in 2013. It was last serviced (by a reputable shop that was reasonably close to me at the time) in July 2017 (prior to a recall that affected Hollis and Oceanic diaphragm first stages sold or serviced between October 2017 and May 2018), who seemingly did not have the Hollis diaphragm service kit so used an Oceanic CDx5 service kit (40.6121) along with an extra couple of o-rings for the swivel mechanism. That was fine and I have not had any issues with the reg since.
Last year I was sourcing kits for all my regs so I could service them myself. I couldn't source a Hollis service kit but was able to source Oceanic kits (for a price). I decided to do what the shop did and get an Oceanic CDX5/TDX5 kit (40.6183, dated Jan 2023). I haven't used it yet since this reg is probably my least-loved and I've not needed it. But I figure I might as well soon. Looking at this (new) service kit compared to the Hollis DC1 service manual (from 2011) and Oceanic CDx5 manual (2003), and the old parts returned to me when the reg was serviced, it's clear the new kit has an entirely new HP seat mechanism. I assume the 2017-2018 recall was due to a bad start with this (or similar) mechanism, which has since been rectified. @rsingler has mentioned the new mechanism performs better (Oceanic CDX & CDX5 and Question - Any issues with swapping my Hollis DCX First stage with a DC7 or MK 11 - DIN?), but I want to be sure it will work (and I know how to assemble it) before I disassemble the reg.
The (2011) Hollis DC1 and (2003) Oceanic CDx5 service manuals both have HP seat (2)6490 ('2' is the Hollis prefix for the same Oceanic part number) paired with cone (2)6697. They have different button pins (DC1 has button pin (2)6892, while CDx5 has button 6696 and pin 6698) but in the old service regime only the seat (and o-rings) in the mechanism were replaced at service.
The new service kit I have includes a long button pin 6694 and a clear plastic seat 'long' 6493.
Can I safely use this service kit? And if so, are there any tricks to it? Or do I just have an expensive collection of o-rings with a few useless (to me) other bits? The photo shows the new button pin and plastic seat, alongside the old HP seat removed when serviced in 2017.
Another, less critical, issue for me is the CDx5 diaphragm and environmental diaphragm are smaller than the Hollis ones. But the Hollis ones are the same size as Apeks ones (and similar part numbers 26893 vs , and I can source those. I assume the shop who did the service last time just swapped them out, and kept the CDx5 diaphragms for a rainy day.
Last year I was sourcing kits for all my regs so I could service them myself. I couldn't source a Hollis service kit but was able to source Oceanic kits (for a price). I decided to do what the shop did and get an Oceanic CDX5/TDX5 kit (40.6183, dated Jan 2023). I haven't used it yet since this reg is probably my least-loved and I've not needed it. But I figure I might as well soon. Looking at this (new) service kit compared to the Hollis DC1 service manual (from 2011) and Oceanic CDx5 manual (2003), and the old parts returned to me when the reg was serviced, it's clear the new kit has an entirely new HP seat mechanism. I assume the 2017-2018 recall was due to a bad start with this (or similar) mechanism, which has since been rectified. @rsingler has mentioned the new mechanism performs better (Oceanic CDX & CDX5 and Question - Any issues with swapping my Hollis DCX First stage with a DC7 or MK 11 - DIN?), but I want to be sure it will work (and I know how to assemble it) before I disassemble the reg.
The (2011) Hollis DC1 and (2003) Oceanic CDx5 service manuals both have HP seat (2)6490 ('2' is the Hollis prefix for the same Oceanic part number) paired with cone (2)6697. They have different button pins (DC1 has button pin (2)6892, while CDx5 has button 6696 and pin 6698) but in the old service regime only the seat (and o-rings) in the mechanism were replaced at service.
The new service kit I have includes a long button pin 6694 and a clear plastic seat 'long' 6493.
Can I safely use this service kit? And if so, are there any tricks to it? Or do I just have an expensive collection of o-rings with a few useless (to me) other bits? The photo shows the new button pin and plastic seat, alongside the old HP seat removed when serviced in 2017.
Another, less critical, issue for me is the CDx5 diaphragm and environmental diaphragm are smaller than the Hollis ones. But the Hollis ones are the same size as Apeks ones (and similar part numbers 26893 vs , and I can source those. I assume the shop who did the service last time just swapped them out, and kept the CDx5 diaphragms for a rainy day.
