yes, you are correct
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Brian,
Glad to hear it worked out for you. I've gotten a few off of the bay that had the o-ring and backup ring reversed. It's nice when you get a reg working well that someone tried to sell you as junk, is it not?
yes, you are correct
OK...so just to be perfectly clear.
When I put everything back together with the BC on the table with the hole up, the nylon ring goes in first (so it's at the bottom) and then the Oring goes in last.