I finally got the 808 to 510 adapter from electronicstix.  It does look odd on top of my skinny little V2 laptop USB pass-thru.  I filled the 
tank (valley vapes poly) with 50/50 PG/VG blend, let it sit for a while, but the vapor was really bitter, like I was trying to vape a dry cart.  I dribbled some pure PG into the batting, and it started to work OK for a while, but now it's doing it again.  I can see the cart inside, it has a two holes, and the tank level is above the holes.  I tried 
vaping with the screw removed in case there was a vacuum build-up, but no change.  What could I possibly be doing wrong?  It's simple, I thought - the tank holds the liquid that goes in the holes to keep the cart wet...