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LP seat is probably old, trashed, or cracked.

The market for these 2 things is a literally a mere handful of folks around the world. Good luck, more for the dives than finding an actual good computer as there are a couple listed earlier.

There's no brown residue, there's missing black dye.

CLR is designed for these kinds of lime scale deposits. Its 2 different acids, lactic and gluconic (not acetic like vinegar). Takes about 2 minutes.

You really should at least try a top post valve like shown. Aka sometimes called in-line. The spirit and sidewinder nearly require them. The roll-offs are a consequence of the long AL14, switch to an AL13 or a 2L and the top valve in them will solve lots of issues.

I've done 2x 180ft+ dives in a day in the Great Lakes. Roughly 100 minute SIs and GF 50/75. I usually pad the deco down to 65-70 surfacing high though.

Below decks with an off-engine PTO is great on a larger vessel. But HOT on a personal sized boat. Bolting as Junior to the back deck with a removable waterproof cover then run a detachable snorkel up to roughly amidships. Then you either run the compressor while underway or at anchor so the...

A gas powered Junior would be 30+% less and work fine for a few tanks a month.

Mine is on my hip - even with the SM cap. It works fine, not a big deal

Well what booster is it?

That BC nipple is going to be a massive constriction on your drive gas flow. Which booster is this? It may be very unhappy running on a massively upsized 1/2" hose (depending on the compressor output)

This is a consumable part to be replaced periodically - I have no idea how often, will depend on hours and amount of water/salt that has gotten into it.

You have to have *some* pressure gradient between the intake and the actual compressor inlet to have gas actually flow. I have a 2" stick and 1.25" hose with a 3cfm compressor. For a 10cfm unit I would probably be up around 4" for the stick itself with baffles and the hose would be the 2" part.

The collar wasn't slide all the way towards the male part. The collar is what holds the bearings in place and prevents them from expanding outwards and releasing

The flow rate issue comes into play when the gas is flowing "against" the sensor as it creates a relatively pressurized membrane. If there is a T in intake line with the cell off to the side it's not an issue. Also you calibrate with the analyzer with the compressor running and no O2 flowing. So...

An OC sized booster might be but have you priced an LP compressor to drive it lately? Ouch

Just vent from the DSV and it'll be at ambient

Those look interesting, they weren't publicized when I was there in 2011-ish. The "problem" with the USGS map is the scale. Their bathymetry was high resolution for its era. But anything smaller than about 10m is too small to resolve. 1 pixel on their map is like 50+m across. The contractor...

Commercial work on surface supplied air

You wanna breath from that someday? It's 2 stage, probably for surface supplied air, back in 1975.