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Both, but it was low/zero vis touch contact situation both times, so my arm holding the shoulder area of the other diver with my elbow down by my side. The big note is that this is a right-side issue, so you are rolling off the long hose. The first time I did this was in an air share...

The large green "T" cylinders are filled by gas supply companies. It works much like propane from the supermarket, where you purchase the tank, then the gas supplier swaps it out for you when empty so you're only paying for the gas and maybe some service fees.

I have personally rolled off my Sidemount tank on multiple occasions with simple arm motions. It is entirely possible, and I was even taught about it in my cave class.

I would have no issues diving again with 90 minutes on the entire system, but since I have the option to dump and rotate, it's not a lot of sorb tossed and it makes me feel better.

I dive a Sidewinder, and I rotate canisters. I would only keep the exhale sorb if it ended the dive completely dry. If I do a 90-minute dive, I'm tossing the exhale sorb dry or not. That out of the way, I was diving last week with a leaking counter lung. Water was seeping through the fabric...

It is pretty easy to rig symmetrically and just swap heads. I do it all the time. There is something about having the fresh sorb on the inhale side that makes me feel more confident.

Don't forget starting with a dry suit and ending with a wetsuit.

I rotate mine somewhat revo style, but I would never only pack one canister.

They are coaxial.

I had mine fitted for 400 gram socks. This will be an option when you get measured. I have no issues wearing a cycling sock+wool winter hiking sock+Forth Element Arctic sock.

I'm very happy with my signature cut TLS. It's held up well so far even with scrapping through tight caves. I have a few friends that are happy after switching from FLX to TLS due to the increased mobility. I use the DUI zip gloves with no issues, but there are tricks to suiting up with...

Have a look at my second post above.

https://indepthmag.com/the-what-which-and-why-of-sidemount/ I've seen enough divers using kit that I believe Toddy style should be in the conversation as well. https://toddy-style.com/system/?lang=en

There are at least three distinct fairly popular sidemount "standards". All can be used in any environment and have there pros and cons. Sounds to me you found two shops that simply do it differently.

There is also no attempt to compensate for how dives skew to the extreme between single tank NDL toward rebreather. Not too many people buy an RB to swim around on shallow warm reefs for an hour. ++ Additionally, way fewer 100 meter + OC dives and 5k+ OC cave penetrations happening these days.

It has been a while since I watched this, bust as an engineer, I remember disagreeing what the the conclusion from the statistics as presented.

I have a friend who had SW swap a fisher to 4 pin on a Nerd 2. Way cheaper than a new Nerd.

I dive a lot in high mineral fresh water. I've found the minerals can dry and clog the pressure sensor port. Rensing with warm tap water usually does the trick. Mine has been replaced by Shearwater as well.

The best cave diving manual I have seen is not from an of the agencies : https://stratiskas.com/books/.

Back in the 90s, I received high school PE credit.