It's almost like a game of "Telephone/Grapevine", only where a bit of fact gets carried on and the overall function gets obscured. I think the o-ring thing starts from some dampers had them from the factory and some didn't. I can even understand the rationale of using blue loc-tite on the screw threads to prevent it from backing out again (If it is possible to get a close to factory adjustment after the screw is removed). The JB weld though leaves me speechless...

I think it is precisely because the folks with a basic understanding didn't elaborate fully that a lot of assumptions and confusion were occurring!

(I did like that it was used for a quick-and-dirty, all-or-nothing fuel pressure test for basic troubleshooting.)