It's funny (not literally) sometimes how regulator builds go when using used regulators. Sometimes you put one together and you can do no wrong. Every once in a while, everything goes wrong. Parts show up wrong. Things get screwed up during shipping. And sometimes you just get screwed.
This afternoon I was removing the low pressure gauge from a ir6000. I should have figured to just leave the gauges alone after breaking my favorite crescent wrench trying to remove it. After putting a bigger wrench on the thing, it became very clear that whoever assembled the darn thing didn't use enough tape on the lower threads. I guess I had it coming though. I've gotten really lucky on every ss build I've done so far. That ir6000 would have been fine if I hadn't wanted to improve the gauges. At least I only had 50 into the reg itself.
I guess the lesson learned here would have been to just leave well enough alone.