thanks guys
Steve the 510 was a real pita and drove me nuts for a while. I tried ordering a bunch of different 510s from fatdaddy, varitube and a few other misc 510's I found here and there, but nothing really did it for me or was really good enough as a bottom feed so I decided to build my own.
originally I had the stock brass 510 shaved down with a spacer to make it flush but one day I was vaping and vaping and the atty got nice and warm, the brass acts like a heat sink so I guess it got warmed up pretty good too and this must have loosened the glue up that held the 510 into the body of the mod, so when I went to twist my atty off I winded up pulling the whole stock brass 510 out of the mod with the atty... it was then that I started thinking about a bolt in 510. I'm a long time car guy and modder/racer so I have adopted a rule for myself long ago that goes something like, if I can break it then it wasn't strong enough to begin with, anything I can break I try to redo to be stronger than it was
I started out with a bar of 316 stainless and machined it down, then threaded it and made it bolt in. at the time all the 510's I made I used a single drilled through ss screw and then used an o ring at the head to seal it and give some room for compression. this worked decently but was not so foolproof, it's possible to over tighten something like that and short it out and eventually even if you don't short it out it can get compressed enough to leak when a shorter 510'd atty is used so here I decided to try something different. I used a hard delrin insert to isolate the pin and made the pin two parts, the lower part threads through the delrin sealing it with tight threading, then the upper pin screws into the lower pin so it is adjustable
the fluid goes through the lower part of the pin then exits that side hole and goes around the upper pin
this is the upper adjustable pin, it's tiny so instead of drilling through it I made the head like a crown of thorns so it digs into the base of the 510 on the atty yet allows juice to pass around and through up to the atty, feeds fine
this is it assembled and adjusted down lower than any atty would be, then simply turn it up till it makes contact where you want it
since doing this one this way I've finally figured out a good way to make the fatdaddy 510's work great, so now I'm going to use the base of the fatdaddy 510 with my own internals and my own retaining nut rather than building the whole thing from scratch like this, plus the new way now winds up being self adjusting like the reo original 510's but with a wider range to accommodate all atties so it's just a screw it down and forget it type deal instead of this which requires adjusting each time a different atty is installed. I figured out a way to use a length of silicone tubing as the seal and the silicone tube length is long enough that it provides good compression and a really good seal. I put that info up in a different fatdaddy 510 thread