A DR8500 is disassembled on my bench. I was going to rework it for use with a soldering iron, but would be amenable to sale or maybe trade for a different stand or other JBC tips.
I think this is accurate, but my meter takes a while to beep for continuity and I might have missed something. So no guarantees.
The B pin on the stand is not connected. The stand has a female connector, not a male connector like the soldering iron stands.