Hoping someone can help me with some confusion I am having. I have one of the very early Impacts and it's been a near flawless gun, but I've finally had an issue come up. The reg. gauge and bottle gauges have started showing the same pressure. I've found where a few other people have had this problem and it sounds like it's most likely an O-ring around, or in the reg. My problem is which O-ring. All of the posts I've been able to find had images that were now dead and I can't wrap my head around which one it would be. I don't want to disassemble my actual regulator if it's not nessesary. Anyway, it would be a huge help if anyone knows which O-ring is the likely culprit and could tell me what number it is on the schematic, or possibly provide a picture of its location etc. Thanks in advance for any help!