Thanks, I really appreciate all the info Iowwall!
Any second stage will work. But it might need to be tuned for the slightly higher IP that Mares specs for the first stage to ensure it doesn't leak gas.
If you get one of the adjustable stages on your list, you might be able to do this without taking the reg apart. If you are getting it serviced anyway, the shop will do the tuning as a matter of course.
I'm not qualified to try anything on my own, so I assumed that whatever I go with (whether used or new) should be brought to my LDS along with my current setup to properly mate them together. I expect that holds true even if a brand new second stage?
My LDS actually just serviced everything a couple of months ago; I assume that although the MR22 and Abyss should be brought in so that the new second stage can be properly tuned, I would only need to pay for the servicing of the one new reg, vs paying more $$$ to reservice the recently serviced first stage... does that sound right?
But I'm sure you can find a Mares second for reasonable money. Post a Want to Buy here or check eBay. I see them all the time.
Because I wasn't sure what is or isn't compatible with the MR22, I was hunting ebay and elsewhere exclusively for standalone Abyss regulators, but all that I was finding was ancient ones from the 90s or ones that were $$$$.
BTW, what's wrong with using your MV in a primary donate setup? If it's just the yellow cover, a Mares dealer can order a black cover for that reg.
The color is my primary reason; I don't want a panicked diver grabbing at the necklaced' octo, however unlikely. A slightly secondary reason is just wanting to do an (affordable) upgrade over the MV so I can get a somewhat modest boost in performance should I actually need to use it. I know in a real emergency primary donate situation, I shouldn't care what I'm breathing from as we slowly ascend to the surface. I'll exclusively be in OW tropical situations.
That said - I didn't realize that getting a black cover for the MV via my LDS was an option. That would easily be the cheapest option and probably the best choice, especially if other options require servicing, LDS turnaround is at least a month, and I want to be diving ASAP, right? Could I simply swap the covers myself?
BTW, what's wrong with using your MV in a primary donate setup? If it's just the yellow cover, a Mares dealer can order a black cover for that reg.
Anyway, I did a quick look at eBay.
Full regset with 2 Rovers (and a 2S which you can use as a paperweight) for $90 with shipping. The Rover is the same as the Prestige and in theory a better performing reg than your MV.
I was under the impression (from this thread) that the Prestige was the midrange workhorse but the Rover/Nikos were budget/rental quality. Am I mistaken and other than cosmetics, they are internally the same and perform the same?
You can even get an extra updated black face plate for $29 with shipping so you'll have a spare stage.
Similar to my MV faceplate question, is this something I can do myself as a noob or is this qualified Mares technician territory?
On a related note, because I'm switching to primary donate length hoses, is this something I can do myself, e.g., unattach/reattach hoses at both the 1st and 2nd stages if done carefully with a torque wrench, or is that still Mares technician territory?