i tried the sealed one from avid vapers that came with a nut. Didnt work either. $7 bucks a pop.
Really sorry for not posting this before now. Have a lot going on and I have to admit I let my reporting on this go.
These are the 510 shorty connectors I've tried that did NOT work:
1. Mobius' sealed connectors than came with a nut - I am very grateful he GAVE me a couple to test free of charge - they didn't work (center pin too short)
2. Mad Vapes' $2 510 Sealed shorty adapter, the one that the center pin sticking out of the bottom is more like a button - too long
3. Avid Vapers' "510 Modders Connector" (sealed) - comes with a nut - center pin too short
So these are 3 nobody else needs to hassle with.
I'm sorry I didn't report this before. It has been very difficult to decide what to say and what not to say lately. But since this will help save folks some hassle I don't know why it would be a problem.
I did try a couple that came with nuts - although I didn't care about the nut, really -- I was looking more closely at the center pin - how long it looked to be, etc.
I'd have to recommend not buying any that came with a nut thinking it is the probably the same one Mad Vapes sells. In my experience it probably won't be.
Cheers